285284321 has 6 divisors (see below), whose sum is σ = 331861410. Its totient is φ = 244529376.

The previous prime is 285284309. The next prime is 285284323. The reversal of 285284321 is 123482582.

It can be written as a sum of positive squares in only one way, i.e., 211993600 + 73290721 = 14560^2 + 8561^2 .

It is a de Polignac number, because none of the positive numbers 2^k-285284321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285284323) 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, 2911016 + ... + 2911113.

It is an arithmetic number, because the mean of its divisors is an integer number (55310235).

Almost surely, 2^285284321 is an apocalyptic number.

It is an amenable number.

285284321 is a deficient number, since it is larger than the sum of its proper divisors (46577089).

285284321 is an equidigital number, since it uses as much as digits as its factorization.

285284321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5822143 (or 5822136 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 285284321 is about 16890.3617782450. The cubic root of 285284321 is about 658.3032026517.

The spelling of 285284321 in words is "two hundred eighty-five million, two hundred eighty-four thousand, three hundred twenty-one".