56815840 has 24 divisors (see below), whose sum is σ = 134227800. Its totient is φ = 22726272.

The previous prime is 56815817. The next prime is 56815849. The reversal of 56815840 is 4851865.

It is a self number, because there is not a number n which added to its sum of digits gives 56815840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56815849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177390 + ... + 177709.

It is an arithmetic number, because the mean of its divisors is an integer number (5592825).

Almost surely, 2^56815840 is an apocalyptic number.

It is an amenable number.

56815840 is an abundant number, since it is smaller than the sum of its proper divisors (77411960).

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

56815840 is a wasteful number, since it uses less digits than its factorization.

56815840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355114 (or 355106 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 56815840 is about 7537.6282741987. The cubic root of 56815840 is about 384.4351981421.

The spelling of 56815840 in words is "fifty-six million, eight hundred fifteen thousand, eight hundred forty".