56139990 has 32 divisors (see below), whose sum is σ = 135129600. Its totient is φ = 14926944.

The previous prime is 56139959. The next prime is 56139991. The reversal of 56139990 is 9993165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56139991) 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, 8461 + ... + 13559.

It is an arithmetic number, because the mean of its divisors is an integer number (4222800).

Almost surely, 2^56139990 is an apocalyptic number.

56139990 is an abundant number, since it is smaller than the sum of its proper divisors (78989610).

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

56139990 is a wasteful number, since it uses less digits than its factorization.

56139990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 56139990 is about 7492.6624106522. The cubic root of 56139990 is about 382.9047703667.

The spelling of 56139990 in words is "fifty-six million, one hundred thirty-nine thousand, nine hundred ninety".