| ||||
|---|---|---|---|---|
| Cardinal | seventy-five | |||
| Ordinal | 75th (seventy-fifth) | |||
| Factorization | 3 × 52 | |||
| Divisors | 1, 3, 5, 15, 25, 75 | |||
| Greek numeral | ΟΕ´ | |||
| Roman numeral | LXXV | |||
| Binary | 10010112 | |||
| Ternary | 22103 | |||
| Senary | 2036 | |||
| Octal | 1138 | |||
| Duodecimal | 6312 | |||
| Hexadecimal | 4B16 | |||
75 (seventy-five) is the natural number following 74 and preceding 76.
75 is a self number because there is no integer that added up to its own digits adds up to 75. [1] It is the sum of the first five pentagonal numbers, and therefore a pentagonal pyramidal number, as well as a nonagonal number. [2] [3]
It is also the fourth ordered Bell number, and a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... [4]
75 is the count of the number of weak orderings on a set of four items. [5]
Excluding the infinite sets, there are 75 uniform polyhedra in the third dimension, which incorporate star polyhedra as well. Inclusive of 7 families of prisms and antiprisms, there are also 75 uniform compound polyhedra.
Seventy-five is:
10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, the most common system of denoting numbers in both spoken and written language.
90 (ninety) is the natural number following 89 and preceding 91.
76 (seventy-six) is the natural number following 75 and preceding 77.
74 (seventy-four) is the natural number following 73 and preceding 75.
31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.
37 (thirty-seven) is the natural number following 36 and preceding 38.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
400 is the natural number following 399 and preceding 401.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
2000 is a natural number following 1999 and preceding 2001.
10,000 is the natural number following 9,999 and preceding 10,001.
135 is the natural number following 134 and preceding 136.
151 is a natural number. It follows 150 and precedes 152.
181 is the natural number following 180 and preceding 182.
5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. It has garnered attention throughout history in part because distal extremities in humans typically contain five digits.
20,000 is the natural number that comes after 19,999 and before 20,001.
60,000 is the natural number that comes after 59,999 and before 60,001. It is a round number. It is the value of (75025).
14 (fourteen) is a natural number following 13 and preceding 15.