889

889 = 7 x 127. It is a product of distinct Mersenne primes.

889 is an odious number because it has an odd number of ones in its binary expansion: 1101111001.

889 is a number such that the sum of its divisors is a square: 1 + 7 + 127 + 889 = 135 = 32 x 32.

889 is the sum of eight positive fifth powers: 889 = 3⁵ + 3⁵ + 3⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵.

In the Dewey Decimal System for classifying books, 889 is the code for literature in medieval and modern Greek

Source: Number Gossip