285724 has 12 divisors (see below), whose sum is σ = 508648. Its totient is φ = 140400.

The previous prime is 285721. The next prime is 285731. The reversal of 285724 is 427582.

It is a d-powerful number, because it can be written as 2¹¹ + 8⁴ + 7⁵ + 5⁴ + 2¹⁸ + 4 .

It is a junction number, because it is equal to n+sod(n) for n = 285692 and 285701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342 + ... + 829.

2²⁸⁵⁷²⁴ is an apocalyptic number.

It is an amenable number.

285724 is a deficient number, since it is larger than the sum of its proper divisors (222924).

285724 is a wasteful number, since it uses less digits than its factorization.

285724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1234 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 285724 is about 534.5315706298. The cubic root of 285724 is about 65.8641220440.

The spelling of 285724 in words is "two hundred eighty-five thousand, seven hundred twenty-four".