79909072 has 30 divisors (see below), whose sum is σ = 160010034. Its totient is φ = 38658240.

The previous prime is 79909057. The next prime is 79909073. The reversal of 79909072 is 27090997.

It can be written as a sum of positive squares in only one way, i.e., 66977856 + 12931216 = 8184^2 + 3596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79909073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12778 + ... + 17974.

Almost surely, 2^79909072 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 79909072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80005017).

79909072 is an abundant number, since it is smaller than the sum of its proper divisors (80100962).

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

79909072 is a wasteful number, since it uses less digits than its factorization.

79909072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5267 (or 5230 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 79909072 is about 8939.1874351084. The cubic root of 79909072 is about 430.7236274199.

The spelling of 79909072 in words is "seventy-nine million, nine hundred nine thousand, seventy-two".