77442864 has 20 divisors (see below), whose sum is σ = 200060856. Its totient is φ = 25814272.

The previous prime is 77442851. The next prime is 77442907. The reversal of 77442864 is 46824477.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806649 + ... + 806744.

Almost surely, 2^77442864 is an apocalyptic number.

It is an amenable number.

77442864 is an abundant number, since it is smaller than the sum of its proper divisors (122617992).

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

77442864 is a wasteful number, since it uses less digits than its factorization.

77442864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613404 (or 1613398 counting only the distinct ones).

The product of its digits is 301056, while the sum is 42.

The square root of 77442864 is about 8800.1627257682. The cubic root of 77442864 is about 426.2461492645.

The spelling of 77442864 in words is "seventy-seven million, four hundred forty-two thousand, eight hundred sixty-four".