77320812 has 24 divisors (see below), whose sum is σ = 180683776. Its totient is φ = 25735248.

The previous prime is 77320807. The next prime is 77320819. The reversal of 77320812 is 21802377.

It is a self number, because there is not a number n which added to its sum of digits gives 77320812.

It is not an unprimeable number, because it can be changed into a prime (77320819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4293 + ... + 13155.

Almost surely, 2^77320812 is an apocalyptic number.

It is an amenable number.

77320812 is an abundant number, since it is smaller than the sum of its proper divisors (103362964).

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

77320812 is a wasteful number, since it uses less digits than its factorization.

77320812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597 (or 9595 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 77320812 is about 8793.2253468224. The cubic root of 77320812 is about 426.0221064593.

The spelling of 77320812 in words is "seventy-seven million, three hundred twenty thousand, eight hundred twelve".