79821920 has 48 divisors (see below), whose sum is σ = 195093360. Its totient is φ = 30825984.

The previous prime is 79821901. The next prime is 79821943. The reversal of 79821920 is 2912897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3962 + ... + 13241.

It is an arithmetic number, because the mean of its divisors is an integer number (4064445).

Almost surely, 2^79821920 is an apocalyptic number.

It is an amenable number.

79821920 is an abundant number, since it is smaller than the sum of its proper divisors (115271440).

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

79821920 is a wasteful number, since it uses less digits than its factorization.

79821920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17247 (or 17239 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 79821920 is about 8934.3113892454. The cubic root of 79821920 is about 430.5669823737.

The spelling of 79821920 in words is "seventy-nine million, eight hundred twenty-one thousand, nine hundred twenty".