79731969 has 8 divisors (see below), whose sum is σ = 109738752. Its totient is φ = 51439920.

The previous prime is 79731959. The next prime is 79731973. The reversal of 79731969 is 96913797.

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

It is not a de Polignac number, because 79731969 - 2¹¹ = 79729921 is a prime.

It is a super-2 number, since 2×79731969² = 12714373761233922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79731919) 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, 428574 + ... + 428759.

It is an arithmetic number, because the mean of its divisors is an integer number (13717344).

Almost surely, 2^79731969 is an apocalyptic number.

It is an amenable number.

79731969 is a deficient number, since it is larger than the sum of its proper divisors (30006783).

79731969 is a wasteful number, since it uses less digits than its factorization.

79731969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857367.

The product of its digits is 642978, while the sum is 51.

The square root of 79731969 is about 8929.2759504901. The cubic root of 79731969 is about 430.4051868504.

The spelling of 79731969 in words is "seventy-nine million, seven hundred thirty-one thousand, nine hundred sixty-nine".