284 (number)

← 283 284 285 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred eighty-four
Ordinal	284th (two hundred eighty-fourth)
Factorization	22 × 71
Divisors	1, 2, 4, 71, 142, 284
Greek numeral	ΣΠΔ´
Roman numeral	CCLXXXIV, cclxxxiv
Binary	1000111002
Ternary	1011123
Senary	11526
Octal	4348
Duodecimal	1B812
Hexadecimal	11C16

284 is the natural number following 283 and preceding 285.

In mathematics

• 284 is an even composite number with 2 distinct prime factors. ^[1]
• 284 is in the first pair of amicable numbers with 220. That means that the sum of the proper divisors are the same between the two numbers. ^[2]
• 284 can be written as a sum of exactly 4 nonzero perfect squares. ^[3]
• 284 is a nontotient number which are numbers where phi(x) equaling that number has no solution. ^[4]
• 284 is a number that is the nth prime plus n. It is the 51st prime number (233) plus 51. ^[5]

References

1. "Composite numbers". mathworld.wolfram.com.
2. "Amicable numbers". mathworld.wolfram.com.
3. Sloane, N. J. A. (ed.). "SequenceA004215(Numbers that are the sum of 4 but no fewer nonzero squares)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
4. Sloane, N. J. A. (ed.). "SequenceA005277". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
5. Sloane, N. J. A. (ed.). "SequenceA014688". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.