79208809 has 4 divisors (see below), whose sum is σ = 80163216. Its totient is φ = 78254404.

The previous prime is 79208743. The next prime is 79208837. The reversal of 79208809 is 90880297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79208809 - 2⁷ = 79208681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79208209) 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, 477079 + ... + 477244.

It is an arithmetic number, because the mean of its divisors is an integer number (20040804).

Almost surely, 2^79208809 is an apocalyptic number.

It is an amenable number.

79208809 is a deficient number, since it is larger than the sum of its proper divisors (954407).

79208809 is an equidigital number, since it uses as much as digits as its factorization.

79208809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954406.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 79208809 is about 8899.9330896361. The cubic root of 79208809 is about 429.4617548817.

The spelling of 79208809 in words is "seventy-nine million, two hundred eight thousand, eight hundred nine".