77136664 has 48 divisors (see below), whose sum is σ = 165037320. Its totient is φ = 33517440.

The previous prime is 77136613. The next prime is 77136679. The reversal of 77136664 is 46663177.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45724 + ... + 47380.

Almost surely, 2^77136664 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 77136664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82518660).

77136664 is an abundant number, since it is smaller than the sum of its proper divisors (87900656).

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

77136664 is a wasteful number, since it uses less digits than its factorization.

77136664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720 (or 1693 counting only the distinct ones).

The product of its digits is 127008, while the sum is 40.

The square root of 77136664 is about 8782.7480892941. The cubic root of 77136664 is about 425.6836314772.

The spelling of 77136664 in words is "seventy-seven million, one hundred thirty-six thousand, six hundred sixty-four".