78927920 has 20 divisors (see below), whose sum is σ = 183507600. Its totient is φ = 31571136.

The previous prime is 78927917. The next prime is 78927941. The reversal of 78927920 is 2972987.

It is a tau number, because it is divible by the number of its divisors (20).

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, 493220 + ... + 493379.

It is an arithmetic number, because the mean of its divisors is an integer number (9175380).

Almost surely, 2^78927920 is an apocalyptic number.

It is an amenable number.

78927920 is an abundant number, since it is smaller than the sum of its proper divisors (104579680).

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

78927920 is a wasteful number, since it uses less digits than its factorization.

78927920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986612 (or 986606 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 78927920 is about 8884.1386751896. The cubic root of 78927920 is about 428.9535035086.

The spelling of 78927920 in words is "seventy-eight million, nine hundred twenty-seven thousand, nine hundred twenty".