977881881 has 16 divisors (see below), whose sum is σ = 1320447744. Its totient is φ = 643659984.

The previous prime is 977881867. The next prime is 977881907. The reversal of 977881881 is 188188779.

It is not a de Polignac number, because 977881881 - 2⁹ = 977881369 is a prime.

It is a super-2 number, since 2×977881881² = 1912505946376196322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (977881811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93586 + ... + 103508.

It is an arithmetic number, because the mean of its divisors is an integer number (82527984).

Almost surely, 2^977881881 is an apocalyptic number.

It is an amenable number.

977881881 is a deficient number, since it is larger than the sum of its proper divisors (342565863).

977881881 is a wasteful number, since it uses less digits than its factorization.

977881881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340.

The product of its digits is 1806336, while the sum is 57.

The square root of 977881881 is about 31271.1029706341. The cubic root of 977881881 is about 992.5722589287.

The spelling of 977881881 in words is "nine hundred seventy-seven million, eight hundred eighty-one thousand, eight hundred eighty-one".