79957999 has 16 divisors (see below), whose sum is σ = 90878976. Its totient is φ = 69703200.

The previous prime is 79957991. The next prime is 79958063. The reversal of 79957999 is 99975997.

It is a cyclic number.

It is not a de Polignac number, because 79957999 - 2³ = 79957991 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 79957999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79957991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27514 + ... + 30280.

It is an arithmetic number, because the mean of its divisors is an integer number (5679936).

Almost surely, 2^79957999 is an apocalyptic number.

79957999 is a deficient number, since it is larger than the sum of its proper divisors (10920977).

79957999 is a wasteful number, since it uses less digits than its factorization.

79957999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2886.

The product of its digits is 14467005, while the sum is 64.

The square root of 79957999 is about 8941.9236744674. The cubic root of 79957999 is about 430.8115177965.

The spelling of 79957999 in words is "seventy-nine million, nine hundred fifty-seven thousand, nine hundred ninety-nine".