656876864 has 28 divisors (see below), whose sum is σ = 1489703904. Its totient is φ = 281518464.

The previous prime is 656876839. The next prime is 656876879. The reversal of 656876864 is 468678656.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732674 + ... + 733569.

Almost surely, 2^656876864 is an apocalyptic number.

656876864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

656876864 is an abundant number, since it is smaller than the sum of its proper divisors (832827040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656876864 is a wasteful number, since it uses less digits than its factorization.

656876864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466262 (or 1466252 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 56.

The square root of 656876864 is about 25629.6091269453. The cubic root of 656876864 is about 869.2832710663.

The spelling of 656876864 in words is "six hundred fifty-six million, eight hundred seventy-six thousand, eight hundred sixty-four".