79950809 has 4 divisors (see below), whose sum is σ = 81261540. Its totient is φ = 78640080.

The previous prime is 79950799. The next prime is 79950811. The reversal of 79950809 is 90805997.

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 38477209 + 41473600 = 6203^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 79950809 - 2²⁰ = 78902233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79950839) 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, 655274 + ... + 655395.

It is an arithmetic number, because the mean of its divisors is an integer number (20315385).

Almost surely, 2^79950809 is an apocalyptic number.

It is an amenable number.

79950809 is a deficient number, since it is larger than the sum of its proper divisors (1310731).

79950809 is a wasteful number, since it uses less digits than its factorization.

79950809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310730.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 79950809 is about 8941.5216266584. The cubic root of 79950809 is about 430.7986042348.

The spelling of 79950809 in words is "seventy-nine million, nine hundred fifty thousand, eight hundred nine".