79109220 has 24 divisors (see below), whose sum is σ = 221505984. Its totient is φ = 21095776.

The previous prime is 79109201. The next prime is 79109227. The reversal of 79109220 is 2290197.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (79109227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659184 + ... + 659303.

It is an arithmetic number, because the mean of its divisors is an integer number (9229416).

Almost surely, 2^79109220 is an apocalyptic number.

It is an amenable number.

79109220 is an abundant number, since it is smaller than the sum of its proper divisors (142396764).

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

79109220 is a wasteful number, since it uses less digits than its factorization.

79109220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318499 (or 1318497 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 79109220 is about 8894.3364002043. The cubic root of 79109220 is about 429.2816924008.

The spelling of 79109220 in words is "seventy-nine million, one hundred nine thousand, two hundred twenty".