689818688 has 56 divisors (see below), whose sum is σ = 1488932760. Its totient is φ = 315187200.

The previous prime is 689818637. The next prime is 689818711. The reversal of 689818688 is 886818986.

It can be written as a sum of positive squares in 4 ways, for example, as 36096064 + 653722624 = 6008^2 + 25568^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 689818688.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79928 + ... + 88136.

It is an arithmetic number, because the mean of its divisors is an integer number (26588085).

Almost surely, 2^689818688 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 689818688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744466380).

689818688 is an abundant number, since it is smaller than the sum of its proper divisors (799114072).

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

689818688 is a wasteful number, since it uses less digits than its factorization.

689818688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8335 (or 8325 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 62.

The square root of 689818688 is about 26264.3996314403. The cubic root of 689818688 is about 883.5781857678.

The spelling of 689818688 in words is "six hundred eighty-nine million, eight hundred eighteen thousand, six hundred eighty-eight".