56391870 has 16 divisors (see below), whose sum is σ = 135340560. Its totient is φ = 15037824.

The previous prime is 56391857. The next prime is 56391887. The reversal of 56391870 is 7819365.

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, 939835 + ... + 939894.

It is an arithmetic number, because the mean of its divisors is an integer number (8458785).

Almost surely, 2^56391870 is an apocalyptic number.

56391870 is an abundant number, since it is smaller than the sum of its proper divisors (78948690).

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

56391870 is a wasteful number, since it uses less digits than its factorization.

56391870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879739.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 56391870 is about 7509.4520439244. The cubic root of 56391870 is about 383.4765681909.

The spelling of 56391870 in words is "fifty-six million, three hundred ninety-one thousand, eight hundred seventy".