79989765 has 16 divisors (see below), whose sum is σ = 132112896. Its totient is φ = 41284800.

The previous prime is 79989739. The next prime is 79989769. The reversal of 79989765 is 56798997.

It is not a de Polignac number, because 79989765 - 2⁵ = 79989733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79989699 and 79989708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79989769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85546 + ... + 86475.

It is an arithmetic number, because the mean of its divisors is an integer number (8257056).

Almost surely, 2^79989765 is an apocalyptic number.

It is an amenable number.

79989765 is a deficient number, since it is larger than the sum of its proper divisors (52123131).

79989765 is a wasteful number, since it uses less digits than its factorization.

79989765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172060.

The product of its digits is 8573040, while the sum is 60.

The square root of 79989765 is about 8943.6997378043. The cubic root of 79989765 is about 430.8685616901.

The spelling of 79989765 in words is "seventy-nine million, nine hundred eighty-nine thousand, seven hundred sixty-five".