56991886 has 16 divisors (see below), whose sum is σ = 100084320. Its totient is φ = 23829120.

The previous prime is 56991859. The next prime is 56991901. The reversal of 56991886 is 68819965.

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, 49071 + ... + 50218.

It is an arithmetic number, because the mean of its divisors is an integer number (6255270).

Almost surely, 2^56991886 is an apocalyptic number.

56991886 is a deficient number, since it is larger than the sum of its proper divisors (43092434).

56991886 is a wasteful number, since it uses less digits than its factorization.

56991886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99339.

The product of its digits is 933120, while the sum is 52.

The square root of 56991886 is about 7549.2970533686. The cubic root of 56991886 is about 384.8318510107.

The spelling of 56991886 in words is "fifty-six million, nine hundred ninety-one thousand, eight hundred eighty-six".