56391000 has 64 divisors (see below), whose sum is σ = 175949280. Its totient is φ = 15036800.

The previous prime is 56390959. The next prime is 56391001. The reversal of 56391000 is 19365.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56391001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6399 + ... + 12398.

Almost surely, 2^56391000 is an apocalyptic number.

56391000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

56391000 is an abundant number, since it is smaller than the sum of its proper divisors (119558280).

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

56391000 is a wasteful number, since it uses less digits than its factorization.

56391000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18821 (or 18807 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 56391000 is about 7509.3941167048. The cubic root of 56391000 is about 383.4745961198.

The spelling of 56391000 in words is "fifty-six million, three hundred ninety-one thousand".