56739880 has 64 divisors (see below), whose sum is σ = 136216080. Its totient is φ = 21196800.

The previous prime is 56739869. The next prime is 56739913. The reversal of 56739880 is 8893765.

It can be written as a sum of positive squares in 8 ways, for example, as 9872164 + 46867716 = 3142^2 + 6846^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 56739880.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122850 + ... + 123310.

Almost surely, 2^56739880 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 56739880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68108040).

56739880 is an abundant number, since it is smaller than the sum of its proper divisors (79476200).

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

56739880 is a wasteful number, since it uses less digits than its factorization.

56739880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 56739880 is about 7532.5878687208. The cubic root of 56739880 is about 384.2637980474.

It can be divided in two parts, 56 and 739880, that added together give a triangular number (739936 = T₁₂₁₆).

The spelling of 56739880 in words is "fifty-six million, seven hundred thirty-nine thousand, eight hundred eighty".