79921220 has 24 divisors (see below), whose sum is σ = 176668800. Its totient is φ = 30285792.

The previous prime is 79921211. The next prime is 79921271. The reversal of 79921220 is 2212997.

79921220 = 1156² + 1157² + ... + 1212².

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, 104780 + ... + 105539.

It is an arithmetic number, because the mean of its divisors is an integer number (7361200).

Almost surely, 2^79921220 is an apocalyptic number.

It is an amenable number.

79921220 is an abundant number, since it is smaller than the sum of its proper divisors (96747580).

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

79921220 is a wasteful number, since it uses less digits than its factorization.

79921220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210347 (or 210345 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 79921220 is about 8939.8668893893. The cubic root of 79921220 is about 430.7454529163.

The spelling of 79921220 in words is "seventy-nine million, nine hundred twenty-one thousand, two hundred twenty".