864

864 = 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3.

864 is the number of integer partitions of 38 into distinct parts.

864 is the sum of a twin prime pair: 864 = 431 + 433.

864 is the sum of six consecutive prime numbers: 864 = 131 + 137 + 139 + 149 + 151 + 157.

864 is a concentric hexagonal number (A032528).

Source: What's Special About This Number?