285776 has 20 divisors (see below), whose sum is σ = 565812. Its totient is φ = 139776.

The previous prime is 285773. The next prime is 285781. The reversal of 285776 is 677582.

285776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 144400 = 376^2 + 380^2 .

Its product of digits (23520) is a multiple of the sum of its prime divisors (392).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285773) 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 3 ways as a sum of consecutive naturals, for example, 680 + ... + 1016.

2²⁸⁵⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

285776 is a deficient number, since it is larger than the sum of its proper divisors (280036).

285776 is a wasteful number, since it uses less digits than its factorization.

285776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 392 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 285776 is about 534.5802091361. The cubic root of 285776 is about 65.8681174225.

The spelling of 285776 in words is "two hundred eighty-five thousand, seven hundred seventy-six".