285644 has 6 divisors (see below), whose sum is σ = 499884. Its totient is φ = 142820.

The previous prime is 285643. The next prime is 285661. The reversal of 285644 is 446582.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285644.

It is not an unprimeable number, because it can be changed into a prime (285641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35702 + ... + 35709.

It is an arithmetic number, because the mean of its divisors is an integer number (83314).

2²⁸⁵⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

285644 is a deficient number, since it is larger than the sum of its proper divisors (214240).

285644 is a wasteful number, since it uses less digits than its factorization.

285644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71415 (or 71413 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 285644 is about 534.4567335154. The cubic root of 285644 is about 65.8579743611.

It can be divided in two parts, 285 and 644, that added together give a palindrome (929).

The spelling of 285644 in words is "two hundred eighty-five thousand, six hundred forty-four".