679944617 has 18 divisors (see below), whose sum is σ = 757387386. Its totient is φ = 609913920.

The previous prime is 679944589. The next prime is 679944619. The reversal of 679944617 is 716449976.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 385101376 + 294843241 = 19624^2 + 17171^2 .

It is not a de Polignac number, because 679944617 - 2⁶ = 679944553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679944619) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3048968 + ... + 3049190.

It is an arithmetic number, because the mean of its divisors is an integer number (42077077).

Almost surely, 2^679944617 is an apocalyptic number.

It is an amenable number.

679944617 is a deficient number, since it is larger than the sum of its proper divisors (77442769).

679944617 is a wasteful number, since it uses less digits than its factorization.

679944617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 347 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 53.

The square root of 679944617 is about 26075.7476786381. The cubic root of 679944617 is about 879.3420602915.

The spelling of 679944617 in words is "six hundred seventy-nine million, nine hundred forty-four thousand, six hundred seventeen".