285229989 has 24 divisors (see below), whose sum is σ = 460422144. Its totient is φ = 168648000.

The previous prime is 285229937. The next prime is 285229999. The reversal of 285229989 is 989922582.

285229989 is a `hidden beast` number, since 28 + 522 + 9 + 98 + 9 = 666.

It is not a de Polignac number, because 285229989 - 2⁸ = 285229733 is a prime.

It is a super-2 number, since 2×285229989² = 162712293249880242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285229999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31077 + ... + 39194.

It is an arithmetic number, because the mean of its divisors is an integer number (19184256).

Almost surely, 2^285229989 is an apocalyptic number.

It is an amenable number.

285229989 is a deficient number, since it is larger than the sum of its proper divisors (175192155).

285229989 is a wasteful number, since it uses less digits than its factorization.

285229989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70329 (or 70326 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 285229989 is about 16888.7533287688. The cubic root of 285229989 is about 658.2614090236.

The spelling of 285229989 in words is "two hundred eighty-five million, two hundred twenty-nine thousand, nine hundred eighty-nine".