78921960 has 64 divisors (see below), whose sum is σ = 254983680. Its totient is φ = 19426560.

The previous prime is 78921959. The next prime is 78921971. The reversal of 78921960 is 6912987.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23736 + ... + 26855.

It is an arithmetic number, because the mean of its divisors is an integer number (3984120).

Almost surely, 2^78921960 is an apocalyptic number.

It is an amenable number.

78921960 is an abundant number, since it is smaller than the sum of its proper divisors (176061720).

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

78921960 is a wasteful number, since it uses less digits than its factorization.

78921960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50618 (or 50614 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 78921960 is about 8883.8032396041. The cubic root of 78921960 is about 428.9427062004.

The spelling of 78921960 in words is "seventy-eight million, nine hundred twenty-one thousand, nine hundred sixty".