285228785 has 4 divisors (see below), whose sum is σ = 342274548. Its totient is φ = 228183024.

The previous prime is 285228767. The next prime is 285228809. The reversal of 285228785 is 587822582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66455104 + 218773681 = 8152^2 + 14791^2 .

It is a cyclic number.

It is not a de Polignac number, because 285228785 - 2⁸ = 285228529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28522874 + ... + 28522883.

It is an arithmetic number, because the mean of its divisors is an integer number (85568637).

Almost surely, 2^285228785 is an apocalyptic number.

It is an amenable number.

285228785 is a deficient number, since it is larger than the sum of its proper divisors (57045763).

285228785 is an equidigital number, since it uses as much as digits as its factorization.

285228785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57045762.

The product of its digits is 716800, while the sum is 47.

The square root of 285228785 is about 16888.7176837083. The cubic root of 285228785 is about 658.2604828145.

The spelling of 285228785 in words is "two hundred eighty-five million, two hundred twenty-eight thousand, seven hundred eighty-five".