685625 has 10 divisors (see below), whose sum is σ = 857538. Its totient is φ = 548000.

The previous prime is 685621. The next prime is 685631. The reversal of 685625 is 526586.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 344569 + 341056 = 587^2 + 584^2 .

It is not a de Polignac number, because 685625 - 2² = 685621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685591 and 685600.

It is not an unprimeable number, because it can be changed into a prime (685621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 77 + ... + 1173.

2⁶⁸⁵⁶²⁵ is an apocalyptic number.

It is an amenable number.

685625 is a deficient number, since it is larger than the sum of its proper divisors (171913).

685625 is an equidigital number, since it uses as much as digits as its factorization.

685625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1102 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 685625 is about 828.0247580840. The cubic root of 685625 is about 88.1784001419.

The spelling of 685625 in words is "six hundred eighty-five thousand, six hundred twenty-five".