688665786328 has 32 divisors (see below), whose sum is σ = 1394776348560. Its totient is φ = 316885472640.

The previous prime is 688665786311. The next prime is 688665786359. The reversal of 688665786328 is 823687566886.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9968275 + ... + 10037122.

Almost surely, 2^688665786328 is an apocalyptic number.

It is an amenable number.

688665786328 is an abundant number, since it is smaller than the sum of its proper divisors (706110562232).

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

688665786328 is a wasteful number, since it uses less digits than its factorization.

688665786328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20005747 (or 20005743 counting only the distinct ones).

The product of its digits is 1114767360, while the sum is 73.

The spelling of 688665786328 in words is "six hundred eighty-eight billion, six hundred sixty-five million, seven hundred eighty-six thousand, three hundred twenty-eight".