679806891 has 24 divisors (see below), whose sum is σ = 1014280560. Its totient is φ = 449998848.

The previous prime is 679806889. The next prime is 679806913. The reversal of 679806891 is 198608976.

It is not a de Polignac number, because 679806891 - 2¹ = 679806889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (679806851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2171751 + ... + 2172063.

It is an arithmetic number, because the mean of its divisors is an integer number (42261690).

Almost surely, 2^679806891 is an apocalyptic number.

679806891 is a deficient number, since it is larger than the sum of its proper divisors (334473669).

679806891 is an equidigital number, since it uses as much as digits as its factorization.

679806891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 679806891 is about 26073.1066618460. The cubic root of 679806891 is about 879.2826846505.

The spelling of 679806891 in words is "six hundred seventy-nine million, eight hundred six thousand, eight hundred ninety-one".