689665589 has 4 divisors (see below), whose sum is σ = 689726880. Its totient is φ = 689604300.

The previous prime is 689665577. The next prime is 689665609. The reversal of 689665589 is 985566986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689665589 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 (689665549) 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, 8369 + ... + 38070.

It is an arithmetic number, because the mean of its divisors is an integer number (172431720).

Almost surely, 2^689665589 is an apocalyptic number.

It is an amenable number.

689665589 is a deficient number, since it is larger than the sum of its proper divisors (61291).

689665589 is a wasteful number, since it uses less digits than its factorization.

689665589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61290.

The product of its digits is 27993600, while the sum is 62.

The square root of 689665589 is about 26261.4848970884. The cubic root of 689665589 is about 883.5128135437.

The spelling of 689665589 in words is "six hundred eighty-nine million, six hundred sixty-five thousand, five hundred eighty-nine".