688664575 has 12 divisors (see below), whose sum is σ = 854273448. Its totient is φ = 550719200.

The previous prime is 688664569. The next prime is 688664591. The reversal of 688664575 is 575466886.

It is not a de Polignac number, because 688664575 - 2⁷ = 688664447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109260 + ... + 115390.

It is an arithmetic number, because the mean of its divisors is an integer number (71189454).

Almost surely, 2^688664575 is an apocalyptic number.

688664575 is a deficient number, since it is larger than the sum of its proper divisors (165608873).

688664575 is a wasteful number, since it uses less digits than its factorization.

688664575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634 (or 10629 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 55.

The square root of 688664575 is about 26242.4193816043. The cubic root of 688664575 is about 883.0851488193.

It can be divided in two parts, 68866 and 4575, that added together give a square (73441 = 271²).

The spelling of 688664575 in words is "six hundred eighty-eight million, six hundred sixty-four thousand, five hundred seventy-five".