77318656 has 20 divisors (see below), whose sum is σ = 154487322. Its totient is φ = 38659072.

The previous prime is 77318639. The next prime is 77318677. The reversal of 77318656 is 65681377.

It can be written as a sum of positive squares in only one way, i.e., 77158656 + 160000 = 8784^2 + 400^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74995 + ... + 76018.

Almost surely, 2^77318656 is an apocalyptic number.

It is an amenable number.

77318656 is a deficient number, since it is larger than the sum of its proper divisors (77168666).

77318656 is an equidigital number, since it uses as much as digits as its factorization.

77318656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151031 (or 151015 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 77318656 is about 8793.1027515889. The cubic root of 77318656 is about 426.0181467139.

The spelling of 77318656 in words is "seventy-seven million, three hundred eighteen thousand, six hundred fifty-six".