79681613 has 8 divisors (see below), whose sum is σ = 87047136. Its totient is φ = 72336400.

The previous prime is 79681603. The next prime is 79681639. The reversal of 79681613 is 31618697.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79681613 - 2¹⁸ = 79419469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79681603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3818 + ... + 13188.

It is an arithmetic number, because the mean of its divisors is an integer number (10880892).

Almost surely, 2^79681613 is an apocalyptic number.

It is an amenable number.

79681613 is a deficient number, since it is larger than the sum of its proper divisors (7365523).

79681613 is a wasteful number, since it uses less digits than its factorization.

79681613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155.

The product of its digits is 54432, while the sum is 41.

The square root of 79681613 is about 8926.4557916342. The cubic root of 79681613 is about 430.3145580090.

The spelling of 79681613 in words is "seventy-nine million, six hundred eighty-one thousand, six hundred thirteen".