285616 has 10 divisors (see below), whose sum is σ = 553412. Its totient is φ = 142800.

The previous prime is 285613. The next prime is 285629. The reversal of 285616 is 616582.

It is a d-powerful number, because it can be written as 2¹⁸ + 8² + 6 + 5⁶ + 1 + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (285611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8910 + ... + 8941.

2²⁸⁵⁶¹⁶ is an apocalyptic number.

It is an amenable number.

285616 is a deficient number, since it is larger than the sum of its proper divisors (267796).

285616 is a wasteful number, since it uses less digits than its factorization.

285616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17859 (or 17853 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 285616 is about 534.4305380496. The cubic root of 285616 is about 65.8558224009.

The spelling of 285616 in words is "two hundred eighty-five thousand, six hundred sixteen".