287 is the natural number following 286 and preceding 288.

• 287 is an odd composite number with 2 prime factors.^[1]
• 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.^[2]
• 287 is an odd semiprime number.^[3]
• 287 is the sum of exactly 4 nonzero squares.^[4]
• 287 is a number where 2(287)-1 and 2(287)+1 are both prime.^[5]