77855916 has 12 divisors (see below), whose sum is σ = 181663832. Its totient is φ = 25951968.

The previous prime is 77855893. The next prime is 77855941. The reversal of 77855916 is 61955877.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3243985 + ... + 3244008.

Almost surely, 2^77855916 is an apocalyptic number.

It is an amenable number.

77855916 is an abundant number, since it is smaller than the sum of its proper divisors (103807916).

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

77855916 is a wasteful number, since it uses less digits than its factorization.

77855916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488000 (or 6487998 counting only the distinct ones).

The product of its digits is 529200, while the sum is 48.

The square root of 77855916 is about 8823.5999456004. The cubic root of 77855916 is about 427.0026197902.

The spelling of 77855916 in words is "seventy-seven million, eight hundred fifty-five thousand, nine hundred sixteen".