56639664 has 30 divisors (see below), whose sum is σ = 158512796. Its totient is φ = 18879840.

The previous prime is 56639663. The next prime is 56639707. The reversal of 56639664 is 46693665.

56639664 is a `hidden beast` number, since 5 + 6 + 639 + 6 + 6 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (56639663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196522 + ... + 196809.

Almost surely, 2^56639664 is an apocalyptic number.

It is an amenable number.

56639664 is an abundant number, since it is smaller than the sum of its proper divisors (101873132).

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

56639664 is a wasteful number, since it uses less digits than its factorization.

56639664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393345 (or 393336 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 56639664 is about 7525.9327661095. The cubic root of 56639664 is about 384.0374312470.

The spelling of 56639664 in words is "fifty-six million, six hundred thirty-nine thousand, six hundred sixty-four".