285646 has 8 divisors (see below), whose sum is σ = 451080. Its totient is φ = 135288.

The previous prime is 285643. The next prime is 285661. The reversal of 285646 is 646582.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285641) 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 3 ways as a sum of consecutive naturals, for example, 3721 + ... + 3796.

It is an arithmetic number, because the mean of its divisors is an integer number (56385).

2²⁸⁵⁶⁴⁶ is an apocalyptic number.

285646 is a deficient number, since it is larger than the sum of its proper divisors (165434).

285646 is a wasteful number, since it uses less digits than its factorization.

285646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7538.

The product of its digits is 11520, while the sum is 31.

The square root of 285646 is about 534.4586045710. The cubic root of 285646 is about 65.8581280672.

The spelling of 285646 in words is "two hundred eighty-five thousand, six hundred forty-six".