285515625 has 28 divisors (see below), whose sum is σ = 475931408. Its totient is φ = 152250000.

The previous prime is 285515623. The next prime is 285515653. The reversal of 285515625 is 526515582.

It is not a de Polignac number, because 285515625 - 2¹ = 285515623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285515623) 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 27 ways as a sum of consecutive naturals, for example, 43830 + ... + 49920.

Almost surely, 2^285515625 is an apocalyptic number.

285515625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

285515625 is a deficient number, since it is larger than the sum of its proper divisors (190415783).

285515625 is an frugal number, since it uses more digits than its factorization.

285515625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6124 (or 6099 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 285515625 is about 16897.2076095431. The cubic root of 285515625 is about 658.4810685199.

The spelling of 285515625 in words is "two hundred eighty-five million, five hundred fifteen thousand, six hundred twenty-five".