689835664 has 20 divisors (see below), whose sum is σ = 1527493504. Its totient is φ = 295643808.

The previous prime is 689835661. The next prime is 689835667. The reversal of 689835664 is 466538986.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (689835661) and next prime (689835667).

It is not an unprimeable number, because it can be changed into a prime (689835661) 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, 3079512 + ... + 3079735.

Almost surely, 2^689835664 is an apocalyptic number.

It is an amenable number.

689835664 is an abundant number, since it is smaller than the sum of its proper divisors (837657840).

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

689835664 is a wasteful number, since it uses less digits than its factorization.

689835664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159262 (or 6159256 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 55.

The square root of 689835664 is about 26264.7228045529. The cubic root of 689835664 is about 883.5854338077.

It can be divided in two parts, 68983 and 5664, that added together give a palindrome (74647).

The spelling of 689835664 in words is "six hundred eighty-nine million, eight hundred thirty-five thousand, six hundred sixty-four".