56615664 has 40 divisors (see below), whose sum is σ = 167152000. Its totient is φ = 16175808.

The previous prime is 56615639. The next prime is 56615677. The reversal of 56615664 is 46651665.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83914 + ... + 84585.

It is an arithmetic number, because the mean of its divisors is an integer number (4178800).

Almost surely, 2^56615664 is an apocalyptic number.

It is an amenable number.

56615664 is an abundant number, since it is smaller than the sum of its proper divisors (110536336).

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

56615664 is a wasteful number, since it uses less digits than its factorization.

56615664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168517 (or 168511 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 56615664 is about 7524.3381104254. The cubic root of 56615664 is about 383.9831806869.

It can be divided in two parts, 5661 and 5664, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 56615664 in words is "fifty-six million, six hundred fifteen thousand, six hundred sixty-four".