56387840 has 36 divisors (see below), whose sum is σ = 135069564. Its totient is φ = 22554624.

The previous prime is 56387831. The next prime is 56387857. The reversal of 56387840 is 4878365.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30824704 + 25563136 = 5552^2 + 5056^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20747 + ... + 23306.

Almost surely, 2^56387840 is an apocalyptic number.

It is an amenable number.

56387840 is an abundant number, since it is smaller than the sum of its proper divisors (78681724).

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

56387840 is an equidigital number, since it uses as much as digits as its factorization.

56387840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44074 (or 44060 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 56387840 is about 7509.1837106306. The cubic root of 56387840 is about 383.4674330243.

The spelling of 56387840 in words is "fifty-six million, three hundred eighty-seven thousand, eight hundred forty".