77968812 has 18 divisors (see below), whose sum is σ = 181998628. Its totient is φ = 25979408.

The previous prime is 77968811. The next prime is 77968823. The reversal of 77968812 is 21886977.

It is not an unprimeable number, because it can be changed into a prime (77968811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29314 + ... + 31862.

Almost surely, 2^77968812 is an apocalyptic number.

It is an amenable number.

77968812 is an abundant number, since it is smaller than the sum of its proper divisors (104029816).

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

77968812 is an equidigital number, since it uses as much as digits as its factorization.

77968812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105 (or 2554 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 77968812 is about 8829.9950169861. The cubic root of 77968812 is about 427.2089137068.

Multiplying 77968812 by its sum of digits (48), we get a square (3742502976 = 61176²).

Multiplying 77968812 by its product of digits (338688), we get a square (26407100998656 = 5138784²).

The spelling of 77968812 in words is "seventy-seven million, nine hundred sixty-eight thousand, eight hundred twelve".