79208721 has 12 divisors (see below), whose sum is σ = 114574720. Its totient is φ = 52731000.

The previous prime is 79208707. The next prime is 79208743. The reversal of 79208721 is 12780297.

It is not a de Polignac number, because 79208721 - 2⁹ = 79208209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79209721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 900 + ... + 12618.

Almost surely, 2^79208721 is an apocalyptic number.

It is an amenable number.

79208721 is a deficient number, since it is larger than the sum of its proper divisors (35365999).

79208721 is a wasteful number, since it uses less digits than its factorization.

79208721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12476 (or 12473 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 79208721 is about 8899.9281457774. The cubic root of 79208721 is about 429.4615958394.

It can be divided in two parts, 7920 and 8721, that added together give a square (16641 = 129²).

The spelling of 79208721 in words is "seventy-nine million, two hundred eight thousand, seven hundred twenty-one".