79639521 has 8 divisors (see below), whose sum is σ = 114354240. Its totient is φ = 49008912.

The previous prime is 79639517. The next prime is 79639523. The reversal of 79639521 is 12593697.

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

It is not a de Polignac number, because 79639521 - 2² = 79639517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79639523) 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, 1020981 + ... + 1021058.

It is an arithmetic number, because the mean of its divisors is an integer number (14294280).

Almost surely, 2^79639521 is an apocalyptic number.

It is an amenable number.

79639521 is a deficient number, since it is larger than the sum of its proper divisors (34714719).

79639521 is a wasteful number, since it uses less digits than its factorization.

79639521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042055.

The product of its digits is 102060, while the sum is 42.

The square root of 79639521 is about 8924.0977695227. The cubic root of 79639521 is about 430.2387731028.

The spelling of 79639521 in words is "seventy-nine million, six hundred thirty-nine thousand, five hundred twenty-one".