285256 has 16 divisors (see below), whose sum is σ = 540540. Its totient is φ = 141120.

The previous prime is 285251. The next prime is 285281. The reversal of 285256 is 652582.

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 100 = 534^2 + 10^2 .

It is not an unprimeable number, because it can be changed into a prime (285251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350 + ... + 1546.

2²⁸⁵²⁵⁶ is an apocalyptic number.

It is an amenable number.

285256 is a deficient number, since it is larger than the sum of its proper divisors (255284).

285256 is a wasteful number, since it uses less digits than its factorization.

285256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 380 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 285256 is about 534.0936247513. The cubic root of 285256 is about 65.8281418043.

It can be divided in two parts, 2 and 85256, that added together give a palindrome (85258).

The spelling of 285256 in words is "two hundred eighty-five thousand, two hundred fifty-six".