688818888812 has 12 divisors (see below), whose sum is σ = 1206034883256. Its totient is φ = 344237493600.

The previous prime is 688818888809. The next prime is 688818888859. The reversal of 688818888812 is 218888818886.

It is a self number, because there is not a number n which added to its sum of digits gives 688818888812.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42978689 + ... + 42994712.

It is an arithmetic number, because the mean of its divisors is an integer number (100502906938).

Almost surely, 2^688818888812 is an apocalyptic number.

It is an amenable number.

688818888812 is a deficient number, since it is larger than the sum of its proper divisors (517215994444).

688818888812 is a wasteful number, since it uses less digits than its factorization.

688818888812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85975408 (or 85975406 counting only the distinct ones).

The product of its digits is 201326592, while the sum is 74.

The spelling of 688818888812 in words is "six hundred eighty-eight billion, eight hundred eighteen million, eight hundred eighty-eight thousand, eight hundred twelve".