79775689 has 4 divisors (see below), whose sum is σ = 91172224. Its totient is φ = 68379156.

The previous prime is 79775681. The next prime is 79775693. The reversal of 79775689 is 98657797.

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 79775689 - 2³ = 79775681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79775681) 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, 5698257 + ... + 5698270.

It is an arithmetic number, because the mean of its divisors is an integer number (22793056).

Almost surely, 2^79775689 is an apocalyptic number.

It is an amenable number.

79775689 is a deficient number, since it is larger than the sum of its proper divisors (11396535).

79775689 is a wasteful number, since it uses less digits than its factorization.

79775689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11396534.

The product of its digits is 6667920, while the sum is 58.

The square root of 79775689 is about 8931.7237418093. The cubic root of 79775689 is about 430.4838415258.

The spelling of 79775689 in words is "seventy-nine million, seven hundred seventy-five thousand, six hundred eighty-nine".