56981904 has 80 divisors (see below), whose sum is σ = 171715200. Its totient is φ = 16275840.

The previous prime is 56981867. The next prime is 56981917. The reversal of 56981904 is 40918965.

56981904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14734 + ... + 18194.

It is an arithmetic number, because the mean of its divisors is an integer number (2146440).

Almost surely, 2^56981904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56981904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85857600).

56981904 is an abundant number, since it is smaller than the sum of its proper divisors (114733296).

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

56981904 is a wasteful number, since it uses less digits than its factorization.

56981904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493 (or 3473 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 56981904 is about 7548.6359032609. The cubic root of 56981904 is about 384.8093822226.

The spelling of 56981904 in words is "fifty-six million, nine hundred eighty-one thousand, nine hundred four".