77138256 has 40 divisors (see below), whose sum is σ = 214604320. Its totient is φ = 23734656.

The previous prime is 77138227. The next prime is 77138287. The reversal of 77138256 is 65283177.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61186 + ... + 62433.

It is an arithmetic number, because the mean of its divisors is an integer number (5365108).

Almost surely, 2^77138256 is an apocalyptic number.

It is an amenable number.

77138256 is an abundant number, since it is smaller than the sum of its proper divisors (137466064).

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

77138256 is a wasteful number, since it uses less digits than its factorization.

77138256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123643 (or 123637 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 77138256 is about 8782.8387210514. The cubic root of 77138256 is about 425.6865599751.

The spelling of 77138256 in words is "seventy-seven million, one hundred thirty-eight thousand, two hundred fifty-six".