79840815 has 8 divisors (see below), whose sum is σ = 127745328. Its totient is φ = 42581760.

The previous prime is 79840807. The next prime is 79840829. The reversal of 79840815 is 51804897.

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

It is not a de Polignac number, because 79840815 - 2³ = 79840807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2661346 + ... + 2661375.

It is an arithmetic number, because the mean of its divisors is an integer number (15968166).

Almost surely, 2^79840815 is an apocalyptic number.

79840815 is a deficient number, since it is larger than the sum of its proper divisors (47904513).

79840815 is a wasteful number, since it uses less digits than its factorization.

79840815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322729.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 79840815 is about 8935.3687668725. The cubic root of 79840815 is about 430.6009534988.

The spelling of 79840815 in words is "seventy-nine million, eight hundred forty thousand, eight hundred fifteen".