Tuesday, December 16, 2008

866

866 = 2 x 433.

866 is the smallest number n such that the sum of the proper divisors of n2, excluding 1, is a square.

866 has a representation as a sum of two squares: 866 = 52 + 292.

866 is the difference of two positive cubes.


866 is one of the telephone area codes for toll-free calls.

Source: Number Gossip
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