56909840 has 40 divisors (see below), whose sum is σ = 142496088. Its totient is φ = 21012480.

The previous prime is 56909819. The next prime is 56909849. The reversal of 56909840 is 4890965.

It can be written as a sum of positive squares in 4 ways, for example, as 3268864 + 53640976 = 1808^2 + 7324^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (56909849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26321 + ... + 28400.

Almost surely, 2^56909840 is an apocalyptic number.

It is an amenable number.

56909840 is an abundant number, since it is smaller than the sum of its proper divisors (85586248).

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

56909840 is a wasteful number, since it uses less digits than its factorization.

56909840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54747 (or 54741 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 56909840 is about 7543.8610803752. The cubic root of 56909840 is about 384.6470932627.

The spelling of 56909840 in words is "fifty-six million, nine hundred nine thousand, eight hundred forty".