79720220 has 48 divisors (see below), whose sum is σ = 175343616. Its totient is φ = 30408000.

The previous prime is 79720213. The next prime is 79720241. The reversal of 79720220 is 2202797.

It is a congruent number.

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, 43115 + ... + 44925.

It is an arithmetic number, because the mean of its divisors is an integer number (3652992).

Almost surely, 2^79720220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79720220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87671808).

79720220 is an abundant number, since it is smaller than the sum of its proper divisors (95623396).

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

79720220 is a wasteful number, since it uses less digits than its factorization.

79720220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 79720220 is about 8928.6180341641. The cubic root of 79720220 is about 430.3840448543.

The spelling of 79720220 in words is "seventy-nine million, seven hundred twenty thousand, two hundred twenty".