688133487996 has 72 divisors (see below), whose sum is σ = 1781866870784. Its totient is φ = 223795988640.

The previous prime is 688133487989. The next prime is 688133487997. The reversal of 688133487996 is 699784331886.

688133487996 is a `hidden beast` number, since 6 + 8 + 8 + 133 + 487 + 9 + 9 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688133487997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1158981 + ... + 1649091.

Almost surely, 2^688133487996 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 688133487996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890933435392).

688133487996 is an abundant number, since it is smaller than the sum of its proper divisors (1093733382788).

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

688133487996 is a wasteful number, since it uses less digits than its factorization.

688133487996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491071 (or 491066 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 688133487996 in words is "six hundred eighty-eight billion, one hundred thirty-three million, four hundred eighty-seven thousand, nine hundred ninety-six".