79990109 has 8 divisors (see below), whose sum is σ = 81095040. Its totient is φ = 78891696.

The previous prime is 79990103. The next prime is 79990111. The reversal of 79990109 is 90109997.

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-79990109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79990109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79990103) 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, 26264 + ... + 29150.

It is an arithmetic number, because the mean of its divisors is an integer number (10136880).

Almost surely, 2^79990109 is an apocalyptic number.

It is an amenable number.

79990109 is a deficient number, since it is larger than the sum of its proper divisors (1104931).

79990109 is a wasteful number, since it uses less digits than its factorization.

79990109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 79990109 is about 8943.7189691984. The cubic root of 79990109 is about 430.8691793465.

The spelling of 79990109 in words is "seventy-nine million, nine hundred ninety thousand, one hundred nine".