79721330 has 32 divisors (see below), whose sum is σ = 163631664. Its totient is φ = 27703296.

The previous prime is 79721311. The next prime is 79721333. The reversal of 79721330 is 3312797.

It can be written as a sum of positive squares in 8 ways, for example, as 50225569 + 29495761 = 7087^2 + 5431^2 .

It is not an unprimeable number, because it can be changed into a prime (79721333) 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, 15827 + ... + 20246.

Almost surely, 2^79721330 is an apocalyptic number.

79721330 is an abundant number, since it is smaller than the sum of its proper divisors (83910334).

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

79721330 is a wasteful number, since it uses less digits than its factorization.

79721330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36110.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 79721330 is about 8928.6801936232. The cubic root of 79721330 is about 430.3860423570.

The spelling of 79721330 in words is "seventy-nine million, seven hundred twenty-one thousand, three hundred thirty".