285528661 has 12 divisors (see below), whose sum is σ = 316739500. Its totient is φ = 257178240.

The previous prime is 285528653. The next prime is 285528679. The reversal of 285528661 is 166825582.

It can be written as a sum of positive squares in 2 ways, for example, as 153140625 + 132388036 = 12375^2 + 11506^2 .

It is not a de Polignac number, because 285528661 - 2³ = 285528653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285528611) 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 11 ways as a sum of consecutive naturals, for example, 2365 + ... + 24013.

Almost surely, 2^285528661 is an apocalyptic number.

It is an amenable number.

285528661 is a deficient number, since it is larger than the sum of its proper divisors (31210839).

285528661 is a wasteful number, since it uses less digits than its factorization.

285528661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21780 (or 21769 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 285528661 is about 16897.5933493501. The cubic root of 285528661 is about 658.4910899546.

The spelling of 285528661 in words is "two hundred eighty-five million, five hundred twenty-eight thousand, six hundred sixty-one".