688525 has 6 divisors (see below), whose sum is σ = 853802. Its totient is φ = 550800.

The previous prime is 688511. The next prime is 688531. The reversal of 688525 is 525886.

It can be written as a sum of positive squares in 3 ways, for example, as 27556 + 660969 = 166^2 + 813^2 .

It is not a de Polignac number, because 688525 - 2⁷ = 688397 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 5 ways as a sum of consecutive naturals, for example, 13746 + ... + 13795.

2⁶⁸⁸⁵²⁵ is an apocalyptic number.

It is an amenable number.

688525 is a deficient number, since it is larger than the sum of its proper divisors (165277).

688525 is a wasteful number, since it uses less digits than its factorization.

688525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27551 (or 27546 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 688525 is about 829.7740656347. The cubic root of 688525 is about 88.3025485067.

The spelling of 688525 in words is "six hundred eighty-eight thousand, five hundred twenty-five".