79618815 has 32 divisors (see below), whose sum is σ = 142018560. Its totient is φ = 42321312.

The previous prime is 79618813. The next prime is 79618831. The reversal of 79618815 is 51881697.

It is not a de Polignac number, because 79618815 - 2¹ = 79618813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79618811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48742 + ... + 50348.

It is an arithmetic number, because the mean of its divisors is an integer number (4438080).

Almost surely, 2^79618815 is an apocalyptic number.

79618815 is a deficient number, since it is larger than the sum of its proper divisors (62399745).

79618815 is a wasteful number, since it uses less digits than its factorization.

79618815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988 (or 1982 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 79618815 is about 8922.9375768297. The cubic root of 79618815 is about 430.2014830066.

The spelling of 79618815 in words is "seventy-nine million, six hundred eighteen thousand, eight hundred fifteen".