977856477 has 24 divisors (see below), whose sum is σ = 1473217344. Its totient is φ = 575587584.

The previous prime is 977856433. The next prime is 977856499. The reversal of 977856477 is 774658779.

It is not a de Polignac number, because 977856477 - 2¹⁴ = 977840093 is a prime.

It is a super-2 number, since 2×977856477² = 1912406579221703058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 977856477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977851477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30268 + ... + 53589.

It is an arithmetic number, because the mean of its divisors is an integer number (61384056).

Almost surely, 2^977856477 is an apocalyptic number.

It is an amenable number.

977856477 is a deficient number, since it is larger than the sum of its proper divisors (495360867).

977856477 is a wasteful number, since it uses less digits than its factorization.

977856477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83909 (or 83896 counting only the distinct ones).

The product of its digits is 20744640, while the sum is 60.

The square root of 977856477 is about 31270.6967782939. The cubic root of 977856477 is about 992.5636636425.

The spelling of 977856477 in words is "nine hundred seventy-seven million, eight hundred fifty-six thousand, four hundred seventy-seven".