56871990 has 64 divisors (see below), whose sum is σ = 173329920. Its totient is φ = 12998880.

The previous prime is 56871967. The next prime is 56872003. The reversal of 56871990 is 9917865.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13156 + ... + 16935.

It is an arithmetic number, because the mean of its divisors is an integer number (2708280).

Almost surely, 2^56871990 is an apocalyptic number.

56871990 is an abundant number, since it is smaller than the sum of its proper divisors (116457930).

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

56871990 is a wasteful number, since it uses less digits than its factorization.

56871990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30114 (or 30108 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 56871990 is about 7541.3520008020. The cubic root of 56871990 is about 384.5617997451.

The spelling of 56871990 in words is "fifty-six million, eight hundred seventy-one thousand, nine hundred ninety".