77761538 has 16 divisors (see below), whose sum is σ = 118752480. Its totient is φ = 38183136.

The previous prime is 77761529. The next prime is 77761559. The reversal of 77761538 is 83516777.

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, 28406 + ... + 31022.

It is an arithmetic number, because the mean of its divisors is an integer number (7422030).

Almost surely, 2^77761538 is an apocalyptic number.

77761538 is a deficient number, since it is larger than the sum of its proper divisors (40990942).

77761538 is a wasteful number, since it uses less digits than its factorization.

77761538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881.

The product of its digits is 246960, while the sum is 44.

The square root of 77761538 is about 8818.2502799592. The cubic root of 77761538 is about 426.8300105644.

The spelling of 77761538 in words is "seventy-seven million, seven hundred sixty-one thousand, five hundred thirty-eight".