285372217 has 24 divisors (see below), whose sum is σ = 332035200. Its totient is φ = 244258560.

The previous prime is 285372179. The next prime is 285372221. The reversal of 285372217 is 712273582.

It is not a de Polignac number, because 285372217 - 2⁷ = 285372089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285372287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203284 + ... + 204682.

It is an arithmetic number, because the mean of its divisors is an integer number (13834800).

Almost surely, 2^285372217 is an apocalyptic number.

It is an amenable number.

285372217 is a deficient number, since it is larger than the sum of its proper divisors (46662983).

285372217 is a wasteful number, since it uses less digits than its factorization.

285372217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1500 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 285372217 is about 16892.9635351527. The cubic root of 285372217 is about 658.3708033721.

The spelling of 285372217 in words is "two hundred eighty-five million, three hundred seventy-two thousand, two hundred seventeen".