79636813 has 6 divisors (see below), whose sum is σ = 82478474. Its totient is φ = 76889904.

The previous prime is 79636759. The next prime is 79636841. The reversal of 79636813 is 31863697.

It can be written as a sum of positive squares in 3 ways, for example, as 8369449 + 71267364 = 2893^2 + 8442^2 .

It is not a de Polignac number, because 79636813 - 2¹³ = 79628621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79636813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79636013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46506 + ... + 48187.

Almost surely, 2^79636813 is an apocalyptic number.

It is an amenable number.

79636813 is a deficient number, since it is larger than the sum of its proper divisors (2841661).

79636813 is an equidigital number, since it uses as much as digits as its factorization.

79636813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94751 (or 94722 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 79636813 is about 8923.9460442116. The cubic root of 79636813 is about 430.2338965466.

It can be divided in two parts, 7963681 and 3, that added together give a square (7963684 = 2822²).

The spelling of 79636813 in words is "seventy-nine million, six hundred thirty-six thousand, eight hundred thirteen".