79279999 has 4 divisors (see below), whose sum is σ = 79364664. Its totient is φ = 79195336.

The previous prime is 79279979. The next prime is 79280041. The reversal of 79279999 is 99997297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99997297 = 6803 ⋅14699.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79279999 is a prime.

It is a Duffinian number.

79279999 is a modest number, since divided by 9999 gives 7927 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79279979) 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, 40912 + ... + 42805.

It is an arithmetic number, because the mean of its divisors is an integer number (19841166).

Almost surely, 2^79279999 is an apocalyptic number.

79279999 is a deficient number, since it is larger than the sum of its proper divisors (84665).

79279999 is an equidigital number, since it uses as much as digits as its factorization.

79279999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84664.

The product of its digits is 5786802, while the sum is 61.

The square root of 79279999 is about 8903.9316596659. The cubic root of 79279999 is about 429.5903778967.

The spelling of 79279999 in words is "seventy-nine million, two hundred seventy-nine thousand, nine hundred ninety-nine".