77818864 has 10 divisors (see below), whose sum is σ = 150774080. Its totient is φ = 38909424.

The previous prime is 77818837. The next prime is 77818883. The reversal of 77818864 is 46881877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2431824 + ... + 2431855.

It is an arithmetic number, because the mean of its divisors is an integer number (15077408).

Almost surely, 2^77818864 is an apocalyptic number.

It is an amenable number.

77818864 is a deficient number, since it is larger than the sum of its proper divisors (72955216).

77818864 is a wasteful number, since it uses less digits than its factorization.

77818864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4863687 (or 4863681 counting only the distinct ones).

The product of its digits is 602112, while the sum is 49.

The square root of 77818864 is about 8821.5000991895. The cubic root of 77818864 is about 426.9348715173.

The spelling of 77818864 in words is "seventy-seven million, eight hundred eighteen thousand, eight hundred sixty-four".