285663 has 16 divisors (see below), whose sum is σ = 444416. Its totient is φ = 159840.

The previous prime is 285661. The next prime is 285667. The reversal of 285663 is 366582.

285663 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 285663 - 2¹ = 285661 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 285663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170 + ... + 1392.

It is an arithmetic number, because the mean of its divisors is an integer number (27776).

2²⁸⁵⁶⁶³ is an apocalyptic number.

285663 is a deficient number, since it is larger than the sum of its proper divisors (158753).

285663 is a wasteful number, since it uses less digits than its factorization.

285663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294.

The product of its digits is 8640, while the sum is 30.

The square root of 285663 is about 534.4745082789. The cubic root of 285663 is about 65.8594345397.

The spelling of 285663 in words is "two hundred eighty-five thousand, six hundred sixty-three".