685682 has 4 divisors (see below), whose sum is σ = 1028526. Its totient is φ = 342840.

The previous prime is 685679. The next prime is 685697. The reversal of 685682 is 286586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 534361 + 151321 = 731^2 + 389^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171419 + ... + 171422.

2⁶⁸⁵⁶⁸² is an apocalyptic number.

685682 is a deficient number, since it is larger than the sum of its proper divisors (342844).

685682 is a wasteful number, since it uses less digits than its factorization.

685682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342843.

The product of its digits is 23040, while the sum is 35.

The square root of 685682 is about 828.0591766293. The cubic root of 685682 is about 88.1808436689.

The spelling of 685682 in words is "six hundred eighty-five thousand, six hundred eighty-two".