79997639 has 8 divisors (see below), whose sum is σ = 83212800. Its totient is φ = 76822200.

The previous prime is 79997633. The next prime is 79997647. The reversal of 79997639 is 93679997.

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-79997639 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 (79997633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5789 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (10401600).

Almost surely, 2^79997639 is an apocalyptic number.

79997639 is a deficient number, since it is larger than the sum of its proper divisors (3215161).

79997639 is a wasteful number, since it uses less digits than its factorization.

79997639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19861.

The product of its digits is 5786802, while the sum is 59.

The square root of 79997639 is about 8944.1399251130. The cubic root of 79997639 is about 430.8826991144.

The spelling of 79997639 in words is "seventy-nine million, nine hundred ninety-seven thousand, six hundred thirty-nine".