79721293 has 4 divisors (see below), whose sum is σ = 80543260. Its totient is φ = 78899328.

The previous prime is 79721281. The next prime is 79721311. The reversal of 79721293 is 39212797.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27910089 + 51811204 = 5283^2 + 7198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79721293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79721233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410838 + ... + 411031.

It is an arithmetic number, because the mean of its divisors is an integer number (20135815).

Almost surely, 2^79721293 is an apocalyptic number.

It is an amenable number.

79721293 is a deficient number, since it is larger than the sum of its proper divisors (821967).

79721293 is an equidigital number, since it uses as much as digits as its factorization.

79721293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821966.

The product of its digits is 47628, while the sum is 40.

The square root of 79721293 is about 8928.6781216482. The cubic root of 79721293 is about 430.3859757739.

The spelling of 79721293 in words is "seventy-nine million, seven hundred twenty-one thousand, two hundred ninety-three".