688704568 has 8 divisors (see below), whose sum is σ = 1291321080. Its totient is φ = 344352280.

The previous prime is 688704547. The next prime is 688704623. The reversal of 688704568 is 865407886.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43044028 + ... + 43044043.

It is an arithmetic number, because the mean of its divisors is an integer number (161415135).

Almost surely, 2^688704568 is an apocalyptic number.

It is an amenable number.

688704568 is a deficient number, since it is larger than the sum of its proper divisors (602616512).

688704568 is a wasteful number, since it uses less digits than its factorization.

688704568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86088077 (or 86088073 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 52.

The square root of 688704568 is about 26243.1813620224. The cubic root of 688704568 is about 883.1022430342.

The spelling of 688704568 in words is "six hundred eighty-eight million, seven hundred four thousand, five hundred sixty-eight".