688994138808 has 48 divisors (see below), whose sum is σ = 1866073435200. Its totient is φ = 229658849280.

The previous prime is 688994138747. The next prime is 688994138821. The reversal of 688994138808 is 808831499886.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3429688 + ... + 3625016.

It is an arithmetic number, because the mean of its divisors is an integer number (38876529900).

Almost surely, 2^688994138808 is an apocalyptic number.

It is an amenable number.

688994138808 is an abundant number, since it is smaller than the sum of its proper divisors (1177079296392).

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

688994138808 is a wasteful number, since it uses less digits than its factorization.

688994138808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244332 (or 244325 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 72.

The spelling of 688994138808 in words is "six hundred eighty-eight billion, nine hundred ninety-four million, one hundred thirty-eight thousand, eight hundred eight".