285639885 has 32 divisors (see below), whose sum is σ = 508872960. Its totient is φ = 152020800.

The previous prime is 285639883. The next prime is 285639917. The reversal of 285639885 is 588936582.

It is not a de Polignac number, because 285639885 - 2¹ = 285639883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285639883) 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 31 ways as a sum of consecutive naturals, for example, 71080 + ... + 74990.

It is an arithmetic number, because the mean of its divisors is an integer number (15902280).

Almost surely, 2^285639885 is an apocalyptic number.

It is an amenable number.

285639885 is a deficient number, since it is larger than the sum of its proper divisors (223233075).

285639885 is a wasteful number, since it uses less digits than its factorization.

285639885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466 (or 4460 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 285639885 is about 16900.8841484699. The cubic root of 285639885 is about 658.5765810863.

The spelling of 285639885 in words is "two hundred eighty-five million, six hundred thirty-nine thousand, eight hundred eighty-five".