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284 (number) 
Summary
284 is the natural number following 283 and preceding 285.
| ||||
|---|---|---|---|---|
| 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 | |||
In mathematics
edit- 284 is an even composite number with 2 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
edit- ^ "Composite numbers". mathworld.wolfram.com.
- ^ "Amicable numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A004215 (Numbers that are the sum of 4 but no fewer nonzero squares)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005277". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A014688". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.