285535 has 4 divisors (see below), whose sum is σ = 342648. Its totient is φ = 228424.

The previous prime is 285533. The next prime is 285539. The reversal of 285535 is 535582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 535582 = 2 ⋅267791.

It is a cyclic number.

It is not a de Polignac number, because 285535 - 2¹ = 285533 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285533) 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, 28549 + ... + 28558.

It is an arithmetic number, because the mean of its divisors is an integer number (85662).

2²⁸⁵⁵³⁵ is an apocalyptic number.

285535 is a deficient number, since it is larger than the sum of its proper divisors (57113).

285535 is an equidigital number, since it uses as much as digits as its factorization.

285535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57112.

The product of its digits is 6000, while the sum is 28.

The square root of 285535 is about 534.3547510783. The cubic root of 285535 is about 65.8495962955.

Subtracting 285535 from its reverse (535582), we obtain a cube (250047 = 63³).

It can be divided in two parts, 285 and 535, that added together give a triangular number (820 = T₄₀).

The spelling of 285535 in words is "two hundred eighty-five thousand, five hundred thirty-five".