285669 has 6 divisors (see below), whose sum is σ = 412646. Its totient is φ = 190440.

The previous prime is 285667. The next prime is 285673. The reversal of 285669 is 966582.

It can be written as a sum of positive squares in only one way, i.e., 263169 + 22500 = 513^2 + 150^2 .

It is not a de Polignac number, because 285669 - 2¹ = 285667 is a prime.

It is a super-2 number, since 2×285669² = 163213555122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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 (285661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15862 + ... + 15879.

2²⁸⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

285669 is a deficient number, since it is larger than the sum of its proper divisors (126977).

285669 is a wasteful number, since it uses less digits than its factorization.

285669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31747 (or 31744 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 285669 is about 534.4801212393. The cubic root of 285669 is about 65.8598956353.

The spelling of 285669 in words is "two hundred eighty-five thousand, six hundred sixty-nine".