79991895 has 16 divisors (see below), whose sum is σ = 128250720. Its totient is φ = 42574464.

The previous prime is 79991827. The next prime is 79991897. The reversal of 79991895 is 59819997.

It is not a de Polignac number, because 79991895 - 2⁹ = 79991383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79991897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2397 + ... + 12873.

It is an arithmetic number, because the mean of its divisors is an integer number (8015670).

Almost surely, 2^79991895 is an apocalyptic number.

79991895 is a deficient number, since it is larger than the sum of its proper divisors (48258825).

79991895 is a wasteful number, since it uses less digits than its factorization.

79991895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10994.

The product of its digits is 1837080, while the sum is 57.

The square root of 79991895 is about 8943.8188152489. The cubic root of 79991895 is about 430.8723861040.

The spelling of 79991895 in words is "seventy-nine million, nine hundred ninety-one thousand, eight hundred ninety-five".