688687725 has 24 divisors (see below), whose sum is σ = 1242143712. Its totient is φ = 333908800.

The previous prime is 688687691. The next prime is 688687733. The reversal of 688687725 is 527786886.

It is a happy number.

It is not a de Polignac number, because 688687725 - 2⁸ = 688687469 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416562 + ... + 418211.

It is an arithmetic number, because the mean of its divisors is an integer number (51755988).

Almost surely, 2^688687725 is an apocalyptic number.

It is an amenable number.

688687725 is a deficient number, since it is larger than the sum of its proper divisors (553455987).

688687725 is a wasteful number, since it uses less digits than its factorization.

688687725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834797 (or 834792 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 57.

The square root of 688687725 is about 26242.8604576559. The cubic root of 688687725 is about 883.0950439085.

The spelling of 688687725 in words is "six hundred eighty-eight million, six hundred eighty-seven thousand, seven hundred twenty-five".