79663999 has 4 divisors (see below), whose sum is σ = 80081280. Its totient is φ = 79246720.

The previous prime is 79663967. The next prime is 79664003. The reversal of 79663999 is 99936697.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79663999 - 2⁵ = 79663967 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 (79663939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208354 + ... + 208735.

It is an arithmetic number, because the mean of its divisors is an integer number (20020320).

Almost surely, 2^79663999 is an apocalyptic number.

79663999 is a deficient number, since it is larger than the sum of its proper divisors (417281).

79663999 is a wasteful number, since it uses less digits than its factorization.

79663999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417280.

The product of its digits is 4960116, while the sum is 58.

The square root of 79663999 is about 8925.4691193236. The cubic root of 79663999 is about 430.2828479782.

The spelling of 79663999 in words is "seventy-nine million, six hundred sixty-three thousand, nine hundred ninety-nine".