285685 has 8 divisors (see below), whose sum is σ = 363096. Its totient is φ = 215040.

The previous prime is 285673. The next prime is 285697. The reversal of 285685 is 586582.

It is an interprime number because it is at equal distance from previous prime (285673) and next prime (285697).

It can be written as a sum of positive squares in 4 ways, for example, as 91204 + 194481 = 302^2 + 441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 285685 - 2⁷ = 285557 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 285685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596 + ... + 1765.

It is an arithmetic number, because the mean of its divisors is an integer number (45387).

2²⁸⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

285685 is a deficient number, since it is larger than the sum of its proper divisors (77411).

285685 is a wasteful number, since it uses less digits than its factorization.

285685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

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

The square root of 285685 is about 534.4950888455. The cubic root of 285685 is about 65.8611251919.

The spelling of 285685 in words is "two hundred eighty-five thousand, six hundred eighty-five".