285671 has 4 divisors (see below), whose sum is σ = 286752. Its totient is φ = 284592.

The previous prime is 285667. The next prime is 285673. The reversal of 285671 is 176582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 285671 - 2² = 285667 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 8³ + 6⁷ + 5⁵ + 7² + 1 .

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285673) 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, 155 + ... + 771.

It is an arithmetic number, because the mean of its divisors is an integer number (71688).

2²⁸⁵⁶⁷¹ is an apocalyptic number.

285671 is a deficient number, since it is larger than the sum of its proper divisors (1081).

285671 is an equidigital number, since it uses as much as digits as its factorization.

285671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its digits is 3360, while the sum is 29.

The square root of 285671 is about 534.4819922130. The cubic root of 285671 is about 65.8600493324.

The spelling of 285671 in words is "two hundred eighty-five thousand, six hundred seventy-one".