79578857 has 4 divisors (see below), whose sum is σ = 79597200. Its totient is φ = 79560516.

The previous prime is 79578839. The next prime is 79578881. The reversal of 79578857 is 75887597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79578857 - 2¹⁴ = 79562473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79578817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394 + ... + 12692.

It is an arithmetic number, because the mean of its divisors is an integer number (19899300).

Almost surely, 2^79578857 is an apocalyptic number.

It is an amenable number.

79578857 is a deficient number, since it is larger than the sum of its proper divisors (18343).

79578857 is a wasteful number, since it uses less digits than its factorization.

79578857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18342.

The product of its digits is 4939200, while the sum is 56.

The square root of 79578857 is about 8920.6982350038. The cubic root of 79578857 is about 430.1295030885.

The spelling of 79578857 in words is "seventy-nine million, five hundred seventy-eight thousand, eight hundred fifty-seven".