79377809 has 4 divisors (see below), whose sum is σ = 90717504. Its totient is φ = 68038116.

The previous prime is 79377803. The next prime is 79377817. The reversal of 79377809 is 90877397.

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 79377809 - 2²⁰ = 78329233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79377803) 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, 5669837 + ... + 5669850.

It is an arithmetic number, because the mean of its divisors is an integer number (22679376).

Almost surely, 2^79377809 is an apocalyptic number.

It is an amenable number.

79377809 is a deficient number, since it is larger than the sum of its proper divisors (11339695).

79377809 is a wasteful number, since it uses less digits than its factorization.

79377809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11339694.

The product of its (nonzero) digits is 666792, while the sum is 50.

The square root of 79377809 is about 8909.4224840895. The cubic root of 79377809 is about 429.7669712684.

The spelling of 79377809 in words is "seventy-nine million, three hundred seventy-seven thousand, eight hundred nine".