285679521 has 8 divisors (see below), whose sum is σ = 423228960. Its totient is φ = 190452996.

The previous prime is 285679507. The next prime is 285679549. The reversal of 285679521 is 125976582.

285679521 is a `hidden beast` number, since 2 + 8 + 56 + 79 + 521 = 666.

It is not a de Polignac number, because 285679521 - 2¹⁷ = 285548449 is a prime.

It is a super-2 number, since 2×285679521² = 163225577437578882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (285679501) 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 7 ways as a sum of consecutive naturals, for example, 5290335 + ... + 5290388.

It is an arithmetic number, because the mean of its divisors is an integer number (52903620).

Almost surely, 2^285679521 is an apocalyptic number.

It is an amenable number.

285679521 is a deficient number, since it is larger than the sum of its proper divisors (137549439).

285679521 is a wasteful number, since it uses less digits than its factorization.

285679521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10580732 (or 10580726 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 285679521 is about 16902.0567091700. The cubic root of 285679521 is about 658.6070415081.

Adding to 285679521 its product of digits (302400), we get a square (285981921 = 16911²).

The spelling of 285679521 in words is "two hundred eighty-five million, six hundred seventy-nine thousand, five hundred twenty-one".