977997888 has 140 divisors (see below), whose sum is σ = 3313371072. Its totient is φ = 279417600.

The previous prime is 977997851. The next prime is 977997893. The reversal of 977997888 is 888799779.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22813 + ... + 49763.

Almost surely, 2^977997888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977997888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656685536).

977997888 is an abundant number, since it is smaller than the sum of its proper divisors (2335373184).

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

977997888 is a wasteful number, since it uses less digits than its factorization.

977997888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26982 (or 26963 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 72.

The square root of 977997888 is about 31272.9577750490. The cubic root of 977997888 is about 992.6115072876.

The spelling of 977997888 in words is "nine hundred seventy-seven million, nine hundred ninety-seven thousand, eight hundred eighty-eight".