77420812 has 24 divisors (see below), whose sum is σ = 158445056. Its totient is φ = 32408208.

The previous prime is 77420809. The next prime is 77420821. The reversal of 77420812 is 21802477.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30948 + ... + 33355.

Almost surely, 2^77420812 is an apocalyptic number.

It is an amenable number.

77420812 is an abundant number, since it is smaller than the sum of its proper divisors (81024244).

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

77420812 is a wasteful number, since it uses less digits than its factorization.

77420812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64357 (or 64355 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 77420812 is about 8798.9097051851. The cubic root of 77420812 is about 426.2056872950.

The spelling of 77420812 in words is "seventy-seven million, four hundred twenty thousand, eight hundred twelve".