688753821996 has 36 divisors (see below), whose sum is σ = 1773865980432. Its totient is φ = 225252821664.

The previous prime is 688753821991. The next prime is 688753822061. The reversal of 688753821996 is 699128357886.

688753821996 is a `hidden beast` number, since 6 + 8 + 87 + 538 + 2 + 1 + 9 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (688753821991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180489136 + ... + 180492951.

It is an arithmetic number, because the mean of its divisors is an integer number (49274055012).

Almost surely, 2^688753821996 is an apocalyptic number.

It is an amenable number.

688753821996 is an abundant number, since it is smaller than the sum of its proper divisors (1085112158436).

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

688753821996 is a wasteful number, since it uses less digits than its factorization.

688753821996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360982150 (or 360982145 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 688753821996 in words is "six hundred eighty-eight billion, seven hundred fifty-three million, eight hundred twenty-one thousand, nine hundred ninety-six".