688598425998 has 192 divisors, whose sum is σ = 1760471856000. Its totient is φ = 194423846400.

The previous prime is 688598425997. The next prime is 688598426041. The reversal of 688598425998 is 899524895886.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688598425993) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 644151408 + ... + 644152476.

It is an arithmetic number, because the mean of its divisors is an integer number (9169124250).

Almost surely, 2^688598425998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688598425998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880235928000).

688598425998 is an abundant number, since it is smaller than the sum of its proper divisors (1071873430002).

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

688598425998 is a wasteful number, since it uses less digits than its factorization.

688598425998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232 (or 2215 counting only the distinct ones).

The product of its digits is 3583180800, while the sum is 81.

The spelling of 688598425998 in words is "six hundred eighty-eight billion, five hundred ninety-eight million, four hundred twenty-five thousand, nine hundred ninety-eight".