688318964 has 6 divisors (see below), whose sum is σ = 1204558194. Its totient is φ = 344159480.

The previous prime is 688318963. The next prime is 688318979. The reversal of 688318964 is 469813886.

688318964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 349390864 + 338928100 = 18692^2 + 18410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688318963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86039867 + ... + 86039874.

It is an arithmetic number, because the mean of its divisors is an integer number (200759699).

Almost surely, 2^688318964 is an apocalyptic number.

It is an amenable number.

688318964 is a deficient number, since it is larger than the sum of its proper divisors (516239230).

688318964 is a wasteful number, since it uses less digits than its factorization.

688318964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172079745 (or 172079743 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 688318964 is about 26235.8335869093. The cubic root of 688318964 is about 882.9373966707.

The spelling of 688318964 in words is "six hundred eighty-eight million, three hundred eighteen thousand, nine hundred sixty-four".