689891664 has 240 divisors, whose sum is σ = 2279854080. Its totient is φ = 175929600.

The previous prime is 689891663. The next prime is 689891681. The reversal of 689891664 is 466198986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689891663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2886457 + ... + 2886695.

It is an arithmetic number, because the mean of its divisors is an integer number (9499392).

Almost surely, 2^689891664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689891664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139927040).

689891664 is an abundant number, since it is smaller than the sum of its proper divisors (1589962416).

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

689891664 is a wasteful number, since it uses less digits than its factorization.

689891664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 333 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The square root of 689891664 is about 26265.7888516603. The cubic root of 689891664 is about 883.6093426158.

The spelling of 689891664 in words is "six hundred eighty-nine million, eight hundred ninety-one thousand, six hundred sixty-four".