79811020 has 48 divisors (see below), whose sum is σ = 177811200. Its totient is φ = 30006720.

The previous prime is 79811009. The next prime is 79811059. The reversal of 79811020 is 2011897.

It is a self number, because there is not a number n which added to its sum of digits gives 79811020.

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, 52065 + ... + 53575.

It is an arithmetic number, because the mean of its divisors is an integer number (3704400).

Almost surely, 2^79811020 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 79811020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88905600).

79811020 is an abundant number, since it is smaller than the sum of its proper divisors (98000180).

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

79811020 is a wasteful number, since it uses less digits than its factorization.

79811020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 79811020 is about 8933.7013605784. The cubic root of 79811020 is about 430.5473829381.

The spelling of 79811020 in words is "seventy-nine million, eight hundred eleven thousand, twenty".