688386664 has 16 divisors (see below), whose sum is σ = 1475114400. Its totient is φ = 295022832.

The previous prime is 688386623. The next prime is 688386667. The reversal of 688386664 is 466683886.

It is not an unprimeable number, because it can be changed into a prime (688386667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6146254 + ... + 6146365.

It is an arithmetic number, because the mean of its divisors is an integer number (92194650).

Almost surely, 2^688386664 is an apocalyptic number.

It is an amenable number.

688386664 is an abundant number, since it is smaller than the sum of its proper divisors (786727736).

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

688386664 is a wasteful number, since it uses less digits than its factorization.

688386664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12292632 (or 12292628 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 55.

The square root of 688386664 is about 26237.1237752921. The cubic root of 688386664 is about 882.9663429903.

The spelling of 688386664 in words is "six hundred eighty-eight million, three hundred eighty-six thousand, six hundred sixty-four".