688850974640 has 40 divisors (see below), whose sum is σ = 1602258453360. Its totient is φ = 275423411456.

The previous prime is 688850974631. The next prime is 688850974649. The reversal of 688850974640 is 46479058886.

688850974640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (688850974631) and next prime (688850974649).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (688850974649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1638050 + ... + 2015169.

It is an arithmetic number, because the mean of its divisors is an integer number (40056461334).

Almost surely, 2^688850974640 is an apocalyptic number.

It is an amenable number.

688850974640 is an abundant number, since it is smaller than the sum of its proper divisors (913407478720).

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

688850974640 is a wasteful number, since it uses less digits than its factorization.

688850974640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655589 (or 3655583 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 65.

The spelling of 688850974640 in words is "six hundred eighty-eight billion, eight hundred fifty million, nine hundred seventy-four thousand, six hundred forty".