77664412 has 18 divisors (see below), whose sum is σ = 158102952. Its totient is φ = 33284664.

The previous prime is 77664409. The next prime is 77664421. The reversal of 77664412 is 21446677.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197928 + ... + 198319.

Almost surely, 2^77664412 is an apocalyptic number.

It is an amenable number.

77664412 is an abundant number, since it is smaller than the sum of its proper divisors (80438540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77664412 is a wasteful number, since it uses less digits than its factorization.

77664412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396265 (or 396256 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 77664412 is about 8812.7414576850. The cubic root of 77664412 is about 426.6522296005.

The spelling of 77664412 in words is "seventy-seven million, six hundred sixty-four thousand, four hundred twelve".