285063281 has 8 divisors (see below), whose sum is σ = 293513064. Its totient is φ = 276652800.

The previous prime is 285063269. The next prime is 285063313. The reversal of 285063281 is 182360582.

It can be written as a sum of positive squares in 4 ways, for example, as 258695056 + 26368225 = 16084^2 + 5135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285063281 - 2¹⁴ = 285046897 is a prime.

It is a super-2 number, since 2×285063281² = 162522148348969922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285063241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5231 + ... + 24443.

It is an arithmetic number, because the mean of its divisors is an integer number (36689133).

Almost surely, 2^285063281 is an apocalyptic number.

It is an amenable number.

285063281 is a deficient number, since it is larger than the sum of its proper divisors (8449783).

285063281 is a wasteful number, since it uses less digits than its factorization.

285063281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19651.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 285063281 is about 16883.8171335750. The cubic root of 285063281 is about 658.1331396345.

The spelling of 285063281 in words is "two hundred eighty-five million, sixty-three thousand, two hundred eighty-one".