79916621 has 8 divisors (see below), whose sum is σ = 81872640. Its totient is φ = 77980768.

The previous prime is 79916593. The next prime is 79916623. The reversal of 79916621 is 12661997.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79916621 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 (79916623) 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, 3140 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (10234080).

Almost surely, 2^79916621 is an apocalyptic number.

It is an amenable number.

79916621 is a deficient number, since it is larger than the sum of its proper divisors (1956019).

79916621 is a wasteful number, since it uses less digits than its factorization.

79916621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10083.

The product of its digits is 40824, while the sum is 41.

The square root of 79916621 is about 8939.6096670940. The cubic root of 79916621 is about 430.7371904618.

The spelling of 79916621 in words is "seventy-nine million, nine hundred sixteen thousand, six hundred twenty-one".