| ||||
|---|---|---|---|---|
| Cardinal | one hundred twenty-eight | |||
| Ordinal | 128th (one hundred twenty-eighth) | |||
| Factorization | 27 | |||
| Divisors | 1, 2, 4, 8, 16, 32, 64, 128 | |||
| Greek numeral | ΡΚΗ´ | |||
| Roman numeral | CXXVIII, cxxviii | |||
| Binary | 100000002 | |||
| Ternary | 112023 | |||
| Senary | 3326 | |||
| Octal | 2008 | |||
| Duodecimal | A812 | |||
| Hexadecimal | 8016 | |||
128 (one hundred [and] twenty-eight) is the natural number following 127 and preceding 129.
128 is the seventh power of 2. It is the largest number which cannot be expressed as the sum of any number of distinct squares. [1] [2] However, it is divisible by the total number of its divisors, making it a refactorable number. [3]
The sum of Euler's totient function φ(x) over the first twenty integers is 128. [4]
128 can be expressed by a combination of its digits with mathematical operators, thus 128 = 28 − 1, making it a Friedman number in base 10. [5]
128 is the only 3-digit number that is a 7th power (27).
Hexadecimal is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.
In computer science, an integer is a datum of integral data type, a data type that represents some range of mathematical integers. Integral data types may be of different sizes and may or may not be allowed to contain negative values. Integers are commonly represented in a computer as a group of binary digits (bits). The size of the grouping varies so the set of integer sizes available varies between different types of computers. Computer hardware nearly always provides a way to represent a processor register or memory address as an integer.
Octal is a numeral system with eight as the base.
A computer number format is the internal representation of numeric values in digital device hardware and software, such as in programmable computers and calculators. Numerical values are stored as groupings of bits, such as bytes and words. The encoding between numerical values and bit patterns is chosen for convenience of the operation of the computer; the encoding used by the computer's instruction set generally requires conversion for external use, such as for printing and display. Different types of processors may have different internal representations of numerical values and different conventions are used for integer and real numbers. Most calculations are carried out with number formats that fit into a processor register, but some software systems allow representation of arbitrarily large numbers using multiple words of memory.
222 is the natural number following 221 and preceding 223.
255 is the natural number following 254 and preceding 256.
Two's complement is the most common method of representing signed integers on computers, and more generally, fixed point binary values. Two's complement uses the binary digit with the greatest value as the sign to indicate whether the binary number is positive or negative; when the most significant bit is 1 the number is signed as negative and when the most significant bit is 0 the number is signed as positive. As a result, non-negative numbers are represented as themselves: 6 is 0110, zero is 0000, and -6 is 1010. Note that while the number of binary bits is fixed throughout a computation it is otherwise arbitrary.
A power of two is a number of the form 2n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent.
54 (fifty-four) is the natural number and positive integer following 53 and preceding 55. As a multiple of 2 but not of 4, 54 is an oddly even number and a composite number.
68 (sixty-eight) is the natural number following 67 and preceding 69. It is an even number.
100 or one hundred is the natural number following 99 and preceding 101.
127 is the natural number following 126 and preceding 128. It is also a prime number.
In computing, signed number representations are required to encode negative numbers in binary number systems.
1,000,000, or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.
In computing, a word is the natural unit of data used by a particular processor design. A word is a fixed-sized datum handled as a unit by the instruction set or the hardware of the processor. The number of bits or digits in a word is an important characteristic of any specific processor design or computer architecture.
In computer architecture, 128-bit integers, memory addresses, or other data units are those that are 128 bits wide. Also, 128-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers, address buses, or data buses of that size.
Finger binary is a system for counting and displaying binary numbers on the fingers of either or both hands. Each finger represents one binary digit or bit. This allows counting from zero to 31 using the fingers of one hand, or 1023 using both: that is, up to 25−1 or 210−1 respectively.
65536 is the natural number following 65535 and preceding 65537.
In computing, bit numbering is the convention used to identify the bit positions in a binary number.
