79618685 has 4 divisors (see below), whose sum is σ = 95542428. Its totient is φ = 63694944.

The previous prime is 79618639. The next prime is 79618687. The reversal of 79618685 is 58681697.

It is a happy number.

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 10745284 + 68873401 = 3278^2 + 8299^2 .

It is a cyclic number.

It is not a de Polignac number, because 79618685 - 2⁶ = 79618621 is a prime.

It is a super-2 number, since 2×79618685² = 12678270002258450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79618687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7961864 + ... + 7961873.

It is an arithmetic number, because the mean of its divisors is an integer number (23885607).

Almost surely, 2^79618685 is an apocalyptic number.

It is an amenable number.

79618685 is a deficient number, since it is larger than the sum of its proper divisors (15923743).

79618685 is a wasteful number, since it uses less digits than its factorization.

79618685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15923742.

The product of its digits is 725760, while the sum is 50.

The square root of 79618685 is about 8922.9302922302. The cubic root of 79618685 is about 430.2012488650.

The spelling of 79618685 in words is "seventy-nine million, six hundred eighteen thousand, six hundred eighty-five".