679279969 has 9 divisors (see below), whose sum is σ = 691347027. Its totient is φ = 667421304.

The previous prime is 679279961. The next prime is 679279973. The reversal of 679279969 is 969972976.

The square root of 679279969 is 26063.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 160351569 + 518928400 = 12663^2 + 22780^2 .

It is not a de Polignac number, because 679279969 - 2³ = 679279961 is a prime.

It is a super-2 number, since 2×679279969² = 922842552569281922, which contains 22 as substring.

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 679279969.

It is not an unprimeable number, because it can be changed into a prime (679279961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1746027 + ... + 1746415.

Almost surely, 2^679279969 is an apocalyptic number.

679279969 is the 26063-rd square number.

679279969 is the 13032-nd centered octagonal number.

It is an amenable number.

679279969 is a deficient number, since it is larger than the sum of its proper divisors (12067058).

679279969 is an frugal number, since it uses more digits than its factorization.

679279969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912 (or 456 counting only the distinct ones).

The product of its digits is 23147208, while the sum is 64.

The cubic root of 679279969 is about 879.0554470070.

Multiplying 679279969 by its sum of digits (64), we get a square (43473918016 = 208504²).

The spelling of 679279969 in words is "six hundred seventy-nine million, two hundred seventy-nine thousand, nine hundred sixty-nine".