77911772 has 12 divisors (see below), whose sum is σ = 137249616. Its totient is φ = 38697600.

The previous prime is 77911699. The next prime is 77911781. The reversal of 77911772 is 27711977.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 63893 + ... + 65100.

It is an arithmetic number, because the mean of its divisors is an integer number (11437468).

Almost surely, 2^77911772 is an apocalyptic number.

It is an amenable number.

77911772 is a deficient number, since it is larger than the sum of its proper divisors (59337844).

77911772 is a wasteful number, since it uses less digits than its factorization.

77911772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129148 (or 129146 counting only the distinct ones).

The product of its digits is 43218, while the sum is 41.

The square root of 77911772 is about 8826.7645261443. The cubic root of 77911772 is about 427.1047098994.

The spelling of 77911772 in words is "seventy-seven million, nine hundred eleven thousand, seven hundred seventy-two".