679727989 has 4 divisors (see below), whose sum is σ = 681745324. Its totient is φ = 677710656.

The previous prime is 679727987. The next prime is 679728011. The reversal of 679727989 is 989727976.

679727989 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.

It can be written as a sum of positive squares in 2 ways, for example, as 148425489 + 531302500 = 12183^2 + 23050^2 .

It is a cyclic number.

It is not a de Polignac number, because 679727989 - 2¹ = 679727987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 679727989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679727987) 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, 1008162 + ... + 1008835.

It is an arithmetic number, because the mean of its divisors is an integer number (170436331).

Almost surely, 2^679727989 is an apocalyptic number.

It is an amenable number.

679727989 is a deficient number, since it is larger than the sum of its proper divisors (2017335).

679727989 is a wasteful number, since it uses less digits than its factorization.

679727989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017334.

The product of its digits is 24004512, while the sum is 64.

The square root of 679727989 is about 26071.5935262883. The cubic root of 679727989 is about 879.2486652608.

The spelling of 679727989 in words is "six hundred seventy-nine million, seven hundred twenty-seven thousand, nine hundred eighty-nine".