79808117 has 4 divisors (see below), whose sum is σ = 80390796. Its totient is φ = 79225440.

The previous prime is 79808111. The next prime is 79808119. The reversal of 79808117 is 71180897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15952036 + 63856081 = 3994^2 + 7991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79808117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79808111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291134 + ... + 291407.

It is an arithmetic number, because the mean of its divisors is an integer number (20097699).

Almost surely, 2^79808117 is an apocalyptic number.

It is an amenable number.

79808117 is a deficient number, since it is larger than the sum of its proper divisors (582679).

79808117 is a wasteful number, since it uses less digits than its factorization.

79808117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582678.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 79808117 is about 8933.5388844511. The cubic root of 79808117 is about 430.5421627141.

The spelling of 79808117 in words is "seventy-nine million, eight hundred eight thousand, one hundred seventeen".