56976257809 has 27 divisors (see below), whose sum is σ = 63964690587. Its totient is φ = 50733615168.

The previous prime is 56976257761. The next prime is 56976257867. The reversal of 56976257809 is 90875267965.

The square root of 56976257809 is 238697.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 44358678225 + 12617579584 = 210615^2 + 112328^2 .

It is a de Polignac number, because none of the positive numbers 2^k-56976257809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56976257509) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 77098762 + ... + 77099500.

Almost surely, 2^56976257809 is an apocalyptic number.

56976257809 is the 238697-th square number.

56976257809 is the 119349-th centered octagonal number.

It is an amenable number.

56976257809 is a deficient number, since it is larger than the sum of its proper divisors (6988432778).

56976257809 is an frugal number, since it uses more digits than its factorization.

56976257809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 64.

Multiplying 56976257809 by its sum of digits (64), we get a square (3646480499776 = 1909576²).

The spelling of 56976257809 in words is "fifty-six billion, nine hundred seventy-six million, two hundred fifty-seven thousand, eight hundred nine".