687725 has 6 divisors (see below), whose sum is σ = 852810. Its totient is φ = 550160.

The previous prime is 687721. The next prime is 687737. The reversal of 687725 is 527786.

It can be written as a sum of positive squares in 3 ways, for example, as 484 + 687241 = 22^2 + 829^2 .

It is not a de Polignac number, because 687725 - 2² = 687721 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687725.

It is not an unprimeable number, because it can be changed into a prime (687721) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 13730 + ... + 13779.

It is an arithmetic number, because the mean of its divisors is an integer number (142135).

2⁶⁸⁷⁷²⁵ is an apocalyptic number.

It is an amenable number.

687725 is a deficient number, since it is larger than the sum of its proper divisors (165085).

687725 is a wasteful number, since it uses less digits than its factorization.

687725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27519 (or 27514 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 687725 is about 829.2918665946. The cubic root of 687725 is about 88.2683355557.

The spelling of 687725 in words is "six hundred eighty-seven thousand, seven hundred twenty-five".