977398644 has 12 divisors (see below), whose sum is σ = 2280596864. Its totient is φ = 325799544.

The previous prime is 977398637. The next prime is 977398657. The reversal of 977398644 is 446893779.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40724932 + ... + 40724955.

Almost surely, 2^977398644 is an apocalyptic number.

It is an amenable number.

977398644 is an abundant number, since it is smaller than the sum of its proper divisors (1303198220).

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

977398644 is a wasteful number, since it uses less digits than its factorization.

977398644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81449894 (or 81449892 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 57.

The square root of 977398644 is about 31263.3754415610. The cubic root of 977398644 is about 992.4087331559.

The spelling of 977398644 in words is "nine hundred seventy-seven million, three hundred ninety-eight thousand, six hundred forty-four".