287 (number)

In mathematics

• 287 is an odd composite number with 2 prime factors.
• 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.
• 287 is an odd semiprime number.
• 287 is the sum of exactly 4 nonzero squares.
• 287 is a number where 6-1 and 6+1 are both prime.