285057 has 12 divisors (see below), whose sum is σ = 433680. Its totient is φ = 179928.

The previous prime is 285049. The next prime is 285071. The reversal of 285057 is 750582.

It is a happy number.

It is not a de Polignac number, because 285057 - 2³ = 285049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285057.

It is not an unprimeable number, because it can be changed into a prime (285007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663 + ... + 1004.

It is an arithmetic number, because the mean of its divisors is an integer number (36140).

2²⁸⁵⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

285057 is a deficient number, since it is larger than the sum of its proper divisors (148623).

285057 is a wasteful number, since it uses less digits than its factorization.

285057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 285057 is about 533.9072953238. The cubic root of 285057 is about 65.8128305895.

The spelling of 285057 in words is "two hundred eighty-five thousand, fifty-seven".