977656857 has 4 divisors (see below), whose sum is σ = 1303542480. Its totient is φ = 651771236.

The previous prime is 977656843. The next prime is 977656877. The reversal of 977656857 is 758656779.

977656857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 977656857 - 2⁶ = 977656793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977656857.

It is not an unprimeable number, because it can be changed into a prime (977656877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162942807 + ... + 162942812.

It is an arithmetic number, because the mean of its divisors is an integer number (325885620).

Almost surely, 2^977656857 is an apocalyptic number.

It is an amenable number.

977656857 is a deficient number, since it is larger than the sum of its proper divisors (325885623).

977656857 is a wasteful number, since it uses less digits than its factorization.

977656857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325885622.

The product of its digits is 22226400, while the sum is 60.

The square root of 977656857 is about 31267.5048093064. The cubic root of 977656857 is about 992.4961182691.

The spelling of 977656857 in words is "nine hundred seventy-seven million, six hundred fifty-six thousand, eight hundred fifty-seven".