77138136 has 64 divisors (see below), whose sum is σ = 223603200. Its totient is φ = 24593184.

The previous prime is 77138111. The next prime is 77138141. The reversal of 77138136 is 63183177.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 77138136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2796 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (3493800).

Almost surely, 2^77138136 is an apocalyptic number.

It is an amenable number.

77138136 is an abundant number, since it is smaller than the sum of its proper divisors (146465064).

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

77138136 is a wasteful number, since it uses less digits than its factorization.

77138136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15565 (or 15555 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 77138136 is about 8782.8318895445. The cubic root of 77138136 is about 425.6863392355.

The spelling of 77138136 in words is "seventy-seven million, one hundred thirty-eight thousand, one hundred thirty-six".