56400988 has 24 divisors (see below), whose sum is σ = 113081472. Its totient is φ = 24111984.

The previous prime is 56400983. The next prime is 56401001. The reversal of 56400988 is 88900465.

It is a super-2 number, since 2×56400988² = 6362142894752288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 56400988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56400983) 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, 10131 + ... + 14677.

It is an arithmetic number, because the mean of its divisors is an integer number (4711728).

Almost surely, 2^56400988 is an apocalyptic number.

It is an amenable number.

56400988 is an abundant number, since it is smaller than the sum of its proper divisors (56680484).

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

56400988 is a wasteful number, since it uses less digits than its factorization.

56400988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 56400988 is about 7510.0591209391. The cubic root of 56400988 is about 383.4972351825.

The spelling of 56400988 in words is "fifty-six million, four hundred thousand, nine hundred eighty-eight".