688933340 has 24 divisors (see below), whose sum is σ = 1485863232. Its totient is φ = 268125120.

The previous prime is 688933337. The next prime is 688933387. The reversal of 688933340 is 43339886.

It is a junction number, because it is equal to n+sod(n) for n = 688933291 and 688933300.

It is a congruent number.

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, 464756 + ... + 466235.

It is an arithmetic number, because the mean of its divisors is an integer number (61910968).

Almost surely, 2^688933340 is an apocalyptic number.

It is an amenable number.

688933340 is an abundant number, since it is smaller than the sum of its proper divisors (796929892).

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

688933340 is a wasteful number, since it uses less digits than its factorization.

688933340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931037 (or 931035 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 688933340 is about 26247.5396942266. The cubic root of 688933340 is about 883.2000143719.

The spelling of 688933340 in words is "six hundred eighty-eight million, nine hundred thirty-three thousand, three hundred forty".