77708631 has 64 divisors (see below), whose sum is σ = 140958720. Its totient is φ = 36771840.

The previous prime is 77708627. The next prime is 77708639. The reversal of 77708631 is 13680777.

It is not a de Polignac number, because 77708631 - 2² = 77708627 is a prime.

It is a super-2 number, since 2×77708631² = 12077262663788322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 77708631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77708639) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339225 + ... + 339453.

It is an arithmetic number, because the mean of its divisors is an integer number (2202480).

Almost surely, 2^77708631 is an apocalyptic number.

77708631 is a deficient number, since it is larger than the sum of its proper divisors (63250089).

77708631 is a wasteful number, since it uses less digits than its factorization.

77708631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 77708631 is about 8815.2499113752. The cubic root of 77708631 is about 426.7331871246.

The spelling of 77708631 in words is "seventy-seven million, seven hundred eight thousand, six hundred thirty-one".