56331990 has 128 divisors (see below), whose sum is σ = 176601600. Its totient is φ = 12597120.

The previous prime is 56331973. The next prime is 56331997. The reversal of 56331990 is 9913365.

56331990 is a `hidden beast` number, since 5 + 633 + 19 + 9 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56331997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37881 + ... + 39339.

It is an arithmetic number, because the mean of its divisors is an integer number (1379700).

Almost surely, 2^56331990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56331990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88300800).

56331990 is an abundant number, since it is smaller than the sum of its proper divisors (120269610).

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

56331990 is a wasteful number, since it uses less digits than its factorization.

56331990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 56331990 is about 7505.4640096399. The cubic root of 56331990 is about 383.3407879248.

The spelling of 56331990 in words is "fifty-six million, three hundred thirty-one thousand, nine hundred ninety".