79915705 has 4 divisors (see below), whose sum is σ = 95898852. Its totient is φ = 63932560.

The previous prime is 79915643. The next prime is 79915709. The reversal of 79915705 is 50751997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50751997 = 43 ⋅1180279.

It can be written as a sum of positive squares in 2 ways, for example, as 37613689 + 42302016 = 6133^2 + 6504^2 .

It is not a de Polignac number, because 79915705 - 2⁹ = 79915193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79915709) 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, 7991566 + ... + 7991575.

It is an arithmetic number, because the mean of its divisors is an integer number (23974713).

Almost surely, 2^79915705 is an apocalyptic number.

It is an amenable number.

79915705 is a deficient number, since it is larger than the sum of its proper divisors (15983147).

79915705 is a wasteful number, since it uses less digits than its factorization.

79915705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15983146.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 79915705 is about 8939.5584342852. The cubic root of 79915705 is about 430.7355447600.

The spelling of 79915705 in words is "seventy-nine million, nine hundred fifteen thousand, seven hundred five".