56971720 has 48 divisors (see below), whose sum is σ = 138465180. Its totient is φ = 20972160.

The previous prime is 56971711. The next prime is 56971721. The reversal of 56971720 is 2717965.

It can be written as a sum of positive squares in 2 ways, for example, as 53027524 + 3944196 = 7282^2 + 1986^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 56971720.

It is not an unprimeable number, because it can be changed into a prime (56971721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171955 + ... + 172285.

Almost surely, 2^56971720 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 56971720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69232590).

56971720 is an abundant number, since it is smaller than the sum of its proper divisors (81493460).

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

56971720 is a wasteful number, since it uses less digits than its factorization.

56971720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 56971720 is about 7547.9613141563. The cubic root of 56971720 is about 384.7864560422.

The spelling of 56971720 in words is "fifty-six million, nine hundred seventy-one thousand, seven hundred twenty".