688868140 has 24 divisors (see below), whose sum is σ = 1460147472. Its totient is φ = 272971200.

The previous prime is 688868113. The next prime is 688868207. The reversal of 688868140 is 41868886.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158811 + ... + 163090.

It is an arithmetic number, because the mean of its divisors is an integer number (60839478).

Almost surely, 2^688868140 is an apocalyptic number.

It is an amenable number.

688868140 is an abundant number, since it is smaller than the sum of its proper divisors (771279332).

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

688868140 is a wasteful number, since it uses less digits than its factorization.

688868140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322017 (or 322015 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 49.

The square root of 688868140 is about 26246.2976436678. The cubic root of 688868140 is about 883.1721517548.

The spelling of 688868140 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, one hundred forty".