688859970768 has 60 divisors (see below), whose sum is σ = 1944911843940. Its totient is φ = 227587949568.

The previous prime is 688859970763. The next prime is 688859970791. The reversal of 688859970768 is 867079958886.

It can be written as a sum of positive squares in 2 ways, for example, as 375631700544 + 313228270224 = 612888^2 + 559668^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688859970763) 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, 21150763 + ... + 21183306.

It is an arithmetic number, because the mean of its divisors is an integer number (32415197399).

Almost surely, 2^688859970768 is an apocalyptic number.

It is an amenable number.

688859970768 is an abundant number, since it is smaller than the sum of its proper divisors (1256051873172).

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

688859970768 is a wasteful number, since it uses less digits than its factorization.

688859970768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42334196 (or 42334187 counting only the distinct ones).

The product of its (nonzero) digits is 2926264320, while the sum is 81.

The spelling of 688859970768 in words is "six hundred eighty-eight billion, eight hundred fifty-nine million, nine hundred seventy thousand, seven hundred sixty-eight".