688688664 has 32 divisors (see below), whose sum is σ = 1732697520. Its totient is φ = 228099456.

The previous prime is 688688657. The next prime is 688688669. The reversal of 688688664 is 466886886.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 688688598 and 688688607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688688669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87619 + ... + 95154.

Almost surely, 2^688688664 is an apocalyptic number.

It is an amenable number.

688688664 is an abundant number, since it is smaller than the sum of its proper divisors (1044008856).

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

688688664 is a wasteful number, since it uses less digits than its factorization.

688688664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182939 (or 182935 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 60.

The square root of 688688664 is about 26242.8783482300. The cubic root of 688688664 is about 883.0954452640.

The spelling of 688688664 in words is "six hundred eighty-eight million, six hundred eighty-eight thousand, six hundred sixty-four".