679123809 has 24 divisors (see below), whose sum is σ = 1207332672. Its totient is φ = 358218720.

The previous prime is 679123801. The next prime is 679123831. The reversal of 679123809 is 908321976.

679123809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 679123809 - 2³ = 679123801 is a prime.

It is a super-2 number, since 2×679123809² = 922418295901336962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (679123801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 413787 + ... + 415424.

It is an arithmetic number, because the mean of its divisors is an integer number (50305528).

Almost surely, 2^679123809 is an apocalyptic number.

It is an amenable number.

679123809 is a deficient number, since it is larger than the sum of its proper divisors (528208863).

679123809 is a wasteful number, since it uses less digits than its factorization.

679123809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829237 (or 829234 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 679123809 is about 26060.0040099767. The cubic root of 679123809 is about 878.9880796840.

The spelling of 679123809 in words is "six hundred seventy-nine million, one hundred twenty-three thousand, eight hundred nine".