79845815 has 16 divisors (see below), whose sum is σ = 112464192. Its totient is φ = 53270784.

The previous prime is 79845803. The next prime is 79845823. The reversal of 79845815 is 51854897.

It is not a de Polignac number, because 79845815 - 2¹⁶ = 79780279 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 79845815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29534 + ... + 32123.

It is an arithmetic number, because the mean of its divisors is an integer number (7029012).

Almost surely, 2^79845815 is an apocalyptic number.

79845815 is a deficient number, since it is larger than the sum of its proper divisors (32618377).

79845815 is a wasteful number, since it uses less digits than its factorization.

79845815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61706.

The product of its digits is 403200, while the sum is 47.

The square root of 79845815 is about 8935.6485494898. The cubic root of 79845815 is about 430.6099420503.

The spelling of 79845815 in words is "seventy-nine million, eight hundred forty-five thousand, eight hundred fifteen".