679625917 has 4 divisors (see below), whose sum is σ = 679716700. Its totient is φ = 679535136.

The previous prime is 679625911. The next prime is 679625951. The reversal of 679625917 is 719526976.

It is a happy number.

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 363817476 + 315808441 = 19074^2 + 17771^2 .

It is a cyclic number.

It is not a de Polignac number, because 679625917 - 2³ = 679625909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679625911) 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, 33042 + ... + 49507.

It is an arithmetic number, because the mean of its divisors is an integer number (169929175).

Almost surely, 2^679625917 is an apocalyptic number.

It is an amenable number.

679625917 is a deficient number, since it is larger than the sum of its proper divisors (90783).

679625917 is an equidigital number, since it uses as much as digits as its factorization.

679625917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90782.

The product of its digits is 1428840, while the sum is 52.

The square root of 679625917 is about 26069.6359199740. The cubic root of 679625917 is about 879.2046519869.

The spelling of 679625917 in words is "six hundred seventy-nine million, six hundred twenty-five thousand, nine hundred seventeen".