56639994 has 16 divisors (see below), whose sum is σ = 113503680. Its totient is φ = 18842720.

The previous prime is 56639981. The next prime is 56640011. The reversal of 56639994 is 49993665.

It is a happy 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, 5934 + ... + 12185.

It is an arithmetic number, because the mean of its divisors is an integer number (7093980).

Almost surely, 2^56639994 is an apocalyptic number.

56639994 is an abundant number, since it is smaller than the sum of its proper divisors (56863686).

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

56639994 is a wasteful number, since it uses less digits than its factorization.

56639994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18645.

The product of its digits is 1574640, while the sum is 51.

The square root of 56639994 is about 7525.9546902702. The cubic root of 56639994 is about 384.0381770854.

The spelling of 56639994 in words is "fifty-six million, six hundred thirty-nine thousand, nine hundred ninety-four".