77938664 has 16 divisors (see below), whose sum is σ = 146573700. Its totient is φ = 38852352.

The previous prime is 77938639. The next prime is 77938667. The reversal of 77938664 is 46683977.

It can be written as a sum of positive squares in 2 ways, for example, as 72965764 + 4972900 = 8542^2 + 2230^2 .

It is a super-2 number, since 2×77938664² = 12148870692209792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77938667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11759 + ... + 17150.

Almost surely, 2^77938664 is an apocalyptic number.

It is an amenable number.

77938664 is a deficient number, since it is larger than the sum of its proper divisors (68635036).

77938664 is a wasteful number, since it uses less digits than its factorization.

77938664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29252 (or 29248 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 50.

The square root of 77938664 is about 8828.2877161996. The cubic root of 77938664 is about 427.1538440176.

The spelling of 77938664 in words is "seventy-seven million, nine hundred thirty-eight thousand, six hundred sixty-four".