79910639 has 8 divisors (see below), whose sum is σ = 82490400. Its totient is φ = 77353056.

The previous prime is 79910609. The next prime is 79910647. The reversal of 79910639 is 93601997.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79910639 - 2²⁴ = 63133423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79910639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79910609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937 + ... + 12789.

It is an arithmetic number, because the mean of its divisors is an integer number (10311300).

Almost surely, 2^79910639 is an apocalyptic number.

79910639 is a deficient number, since it is larger than the sum of its proper divisors (2579761).

79910639 is a wasteful number, since it uses less digits than its factorization.

79910639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11089.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 79910639 is about 8939.2750824661. The cubic root of 79910639 is about 430.7264428679.

The spelling of 79910639 in words is "seventy-nine million, nine hundred ten thousand, six hundred thirty-nine".