77906864 has 30 divisors (see below), whose sum is σ = 175590324. Its totient is φ = 33388320.

The previous prime is 77906837. The next prime is 77906891. The reversal of 77906864 is 46860977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77906837) and next prime (77906891).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48902 + ... + 50469.

Almost surely, 2^77906864 is an apocalyptic number.

It is an amenable number.

77906864 is an abundant number, since it is smaller than the sum of its proper divisors (97683460).

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

77906864 is a wasteful number, since it uses less digits than its factorization.

77906864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99393 (or 99380 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77906864 is about 8826.4865037001. The cubic root of 77906864 is about 427.0957413192.

The spelling of 77906864 in words is "seventy-seven million, nine hundred six thousand, eight hundred sixty-four".