977808644 has 12 divisors (see below), whose sum is σ = 1712299344. Its totient is φ = 488580264.

The previous prime is 977808613. The next prime is 977808673. The reversal of 977808644 is 446808779.

It is a super-2 number, since 2×977808644² = 1912219488562237472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74162 + ... + 86345.

It is an arithmetic number, because the mean of its divisors is an integer number (142691612).

Almost surely, 2^977808644 is an apocalyptic number.

It is an amenable number.

977808644 is a deficient number, since it is larger than the sum of its proper divisors (734490700).

977808644 is a wasteful number, since it uses less digits than its factorization.

977808644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162034 (or 162032 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The square root of 977808644 is about 31269.9319474795. The cubic root of 977808644 is about 992.5474792388.

The spelling of 977808644 in words is "nine hundred seventy-seven million, eight hundred eight thousand, six hundred forty-four".