977664631 has 4 divisors (see below), whose sum is σ = 978022512. Its totient is φ = 977306752.

The previous prime is 977664619. The next prime is 977664661. The reversal of 977664631 is 136466779.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136466779 = 29 ⋅4705751.

It is a cyclic number.

It is not a de Polignac number, because 977664631 - 2⁵ = 977664599 is a prime.

It is a super-2 number, since 2×977664631² = 1911656261416732322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977664601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174811 + ... + 180316.

It is an arithmetic number, because the mean of its divisors is an integer number (244505628).

Almost surely, 2^977664631 is an apocalyptic number.

977664631 is a deficient number, since it is larger than the sum of its proper divisors (357881).

977664631 is a wasteful number, since it uses less digits than its factorization.

977664631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357880.

The product of its digits is 1143072, while the sum is 49.

The square root of 977664631 is about 31267.6291234241. The cubic root of 977664631 is about 992.4987489277.

The spelling of 977664631 in words is "nine hundred seventy-seven million, six hundred sixty-four thousand, six hundred thirty-one".