79891015 has 16 divisors (see below), whose sum is σ = 98444160. Its totient is φ = 62217760.

The previous prime is 79891013. The next prime is 79891037. The reversal of 79891015 is 51019897.

It is a happy number.

It is not a de Polignac number, because 79891015 - 2¹ = 79891013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79891013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30300 + ... + 32830.

It is an arithmetic number, because the mean of its divisors is an integer number (6152760).

Almost surely, 2^79891015 is an apocalyptic number.

79891015 is a deficient number, since it is larger than the sum of its proper divisors (18553145).

79891015 is a wasteful number, since it uses less digits than its factorization.

79891015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 79891015 is about 8938.1773869173. The cubic root of 79891015 is about 430.6911815317.

The spelling of 79891015 in words is "seventy-nine million, eight hundred ninety-one thousand, fifteen".