689617656 has 96 divisors (see below), whose sum is σ = 2298747360. Its totient is φ = 181875456.

The previous prime is 689617613. The next prime is 689617681. The reversal of 689617656 is 656716986.

It is a super-2 number, since 2×689617656² = 951145022933868672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46075 + ... + 59178.

It is an arithmetic number, because the mean of its divisors is an integer number (23945285).

Almost surely, 2^689617656 is an apocalyptic number.

It is an amenable number.

689617656 is an abundant number, since it is smaller than the sum of its proper divisors (1609129704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689617656 is a wasteful number, since it uses less digits than its factorization.

689617656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105285 (or 105278 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 689617656 is about 26260.5722709921. The cubic root of 689617656 is about 883.4923444924.

The spelling of 689617656 in words is "six hundred eighty-nine million, six hundred seventeen thousand, six hundred fifty-six".