79131220 has 48 divisors (see below), whose sum is σ = 196051968. Its totient is φ = 26254080.

The previous prime is 79131211. The next prime is 79131229. The reversal of 79131220 is 2213197.

It is an interprime number because it is at equal distance from previous prime (79131211) and next prime (79131229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79131229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4777 + ... + 13456.

It is an arithmetic number, because the mean of its divisors is an integer number (4084416).

Almost surely, 2^79131220 is an apocalyptic number.

79131220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79131220 is an abundant number, since it is smaller than the sum of its proper divisors (116920748).

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

79131220 is a wasteful number, since it uses less digits than its factorization.

79131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18280 (or 18278 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 79131220 is about 8895.5730563017. The cubic root of 79131220 is about 429.3214826297.

The spelling of 79131220 in words is "seventy-nine million, one hundred thirty-one thousand, two hundred twenty".