56638566 has 24 divisors (see below), whose sum is σ = 126949680. Its totient is φ = 18228336.

The previous prime is 56638559. The next prime is 56638597. The reversal of 56638566 is 66583665.

56638566 is a `hidden beast` number, since 5 + 6 + 638 + 5 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53730 + ... + 54773.

It is an arithmetic number, because the mean of its divisors is an integer number (5289570).

Almost surely, 2^56638566 is an apocalyptic number.

56638566 is an abundant number, since it is smaller than the sum of its proper divisors (70311114).

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

56638566 is a wasteful number, since it uses less digits than its factorization.

56638566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108540 (or 108537 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 56638566 is about 7525.8598179876. The cubic root of 56638566 is about 384.0349496185.

The spelling of 56638566 in words is "fifty-six million, six hundred thirty-eight thousand, five hundred sixty-six".