687285 has 20 divisors (see below), whose sum is σ = 1232748. Its totient is φ = 366336.

The previous prime is 687277. The next prime is 687289. The reversal of 687285 is 582786.

It can be written as a sum of positive squares in 2 ways, for example, as 492804 + 194481 = 702^2 + 441^2 .

It is not a de Polignac number, because 687285 - 2³ = 687277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687289) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 444 + ... + 1253.

2⁶⁸⁷²⁸⁵ is an apocalyptic number.

It is an amenable number.

687285 is a deficient number, since it is larger than the sum of its proper divisors (545463).

687285 is a wasteful number, since it uses less digits than its factorization.

687285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1705 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 687285 is about 829.0265375728. The cubic root of 687285 is about 88.2495071222.

The spelling of 687285 in words is "six hundred eighty-seven thousand, two hundred eighty-five".