679894979 has 4 divisors (see below), whose sum is σ = 679972584. Its totient is φ = 679817376.

The previous prime is 679894967. The next prime is 679895003. The reversal of 679894979 is 979498976.

679894979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 679894979 - 2⁸ = 679894723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679894079) 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, 23702 + ... + 43835.

It is an arithmetic number, because the mean of its divisors is an integer number (169993146).

Almost surely, 2^679894979 is an apocalyptic number.

679894979 is a deficient number, since it is larger than the sum of its proper divisors (77605).

679894979 is a wasteful number, since it uses less digits than its factorization.

679894979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77604.

The product of its digits is 61725888, while the sum is 68.

The square root of 679894979 is about 26074.7958573025. The cubic root of 679894979 is about 879.3206615667.

The spelling of 679894979 in words is "six hundred seventy-nine million, eight hundred ninety-four thousand, nine hundred seventy-nine".