77638164 has 12 divisors (see below), whose sum is σ = 181155744. Its totient is φ = 25879384.

The previous prime is 77638147. The next prime is 77638181. The reversal of 77638164 is 46183677.

It is an interprime number because it is at equal distance from previous prime (77638147) and next prime (77638181).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234912 + ... + 3234935.

It is an arithmetic number, because the mean of its divisors is an integer number (15096312).

Almost surely, 2^77638164 is an apocalyptic number.

It is an amenable number.

77638164 is an abundant number, since it is smaller than the sum of its proper divisors (103517580).

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

77638164 is a wasteful number, since it uses less digits than its factorization.

77638164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469854 (or 6469852 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 77638164 is about 8811.2521244146. The cubic root of 77638164 is about 426.6041594086.

The spelling of 77638164 in words is "seventy-seven million, six hundred thirty-eight thousand, one hundred sixty-four".