689656917 has 8 divisors (see below), whose sum is σ = 951251040. Its totient is φ = 443917040.

The previous prime is 689656873. The next prime is 689656921. The reversal of 689656917 is 719656986.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689656917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689656217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3963459 + ... + 3963632.

It is an arithmetic number, because the mean of its divisors is an integer number (118906380).

Almost surely, 2^689656917 is an apocalyptic number.

It is an amenable number.

689656917 is a deficient number, since it is larger than the sum of its proper divisors (261594123).

689656917 is a wasteful number, since it uses less digits than its factorization.

689656917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7927123.

The product of its digits is 4898880, while the sum is 57.

The square root of 689656917 is about 26261.3197878553. The cubic root of 689656917 is about 883.5091103696.

The spelling of 689656917 in words is "six hundred eighty-nine million, six hundred fifty-six thousand, nine hundred seventeen".