287 (number)
Natural number
From Wikipedia, the free encyclopedia
287 is the natural number following 286 and preceding 288.
Cardinaltwo hundred eighty-seven
Ordinal287th
(two hundred eighty-seventh)
(two hundred eighty-seventh)
Factorization7 × 41
Divisors1, 7, 41, 287
| ||||
|---|---|---|---|---|
| Cardinal | two hundred eighty-seven | |||
| Ordinal | 287th (two hundred eighty-seventh) | |||
| Factorization | 7 × 41 | |||
| Divisors | 1, 7, 41, 287 | |||
| Greek numeral | ΣΠΖ´ | |||
| Roman numeral | CCLXXXVII, cclxxxvii | |||
| Binary | 1000111112 | |||
| Ternary | 1011223 | |||
| Senary | 11556 | |||
| Octal | 4378 | |||
| Duodecimal | 1BB12 | |||
| Hexadecimal | 11F16 | |||
In mathematics
- 287 is an odd composite number with 2 prime factors, namely 7 and 41. This makes it a semiprime.[1][2]
- 287 is the sum of consecutive primes in three different ways, 89+97+101, 43+53+59+61+67, and 17+19+23+29+31+37+41+43+47
- 287 is a pentagonal number which follows the concept of triangular numbers.[3]
- 287 is the sum of exactly 4 nonzero squares.[4]
- 287 is a number where 6(287)-1 and 6(287)+1 are both prime.[5]