79457999 has 4 divisors (see below), whose sum is σ = 82197960. Its totient is φ = 76718040.

The previous prime is 79457977. The next prime is 79458007. The reversal of 79457999 is 99975497.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79457999 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 (79457969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369937 + ... + 1369994.

It is an arithmetic number, because the mean of its divisors is an integer number (20549490).

Almost surely, 2^79457999 is an apocalyptic number.

79457999 is a deficient number, since it is larger than the sum of its proper divisors (2739961).

79457999 is a wasteful number, since it uses less digits than its factorization.

79457999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739960.

The product of its digits is 6429780, while the sum is 59.

The square root of 79457999 is about 8913.9216397723. The cubic root of 79457999 is about 429.9116440057.

The spelling of 79457999 in words is "seventy-nine million, four hundred fifty-seven thousand, nine hundred ninety-nine".