689967664 has 20 divisors (see below), whose sum is σ = 1338855280. Its totient is φ = 344456640.

The previous prime is 689967647. The next prime is 689967683. The reversal of 689967664 is 466769986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22044 + ... + 43195.

It is an arithmetic number, because the mean of its divisors is an integer number (66942764).

Almost surely, 2^689967664 is an apocalyptic number.

It is an amenable number.

689967664 is a deficient number, since it is larger than the sum of its proper divisors (648887616).

689967664 is a wasteful number, since it uses less digits than its factorization.

689967664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65908 (or 65902 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 61.

The square root of 689967664 is about 26267.2355606752. The cubic root of 689967664 is about 883.6417882145.

The spelling of 689967664 in words is "six hundred eighty-nine million, nine hundred sixty-seven thousand, six hundred sixty-four".