285280825 has 12 divisors (see below), whose sum is σ = 374557500. Its totient is φ = 214799360.

The previous prime is 285280819. The next prime is 285280837. The reversal of 285280825 is 528082582.

It can be written as a sum of positive squares in 6 ways, for example, as 10517049 + 274763776 = 3243^2 + 16576^2 .

It is not a de Polignac number, because 285280825 - 2⁹ = 285280313 is a prime.

It is a super-2 number, since 2×285280825² = 162770298225361250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335200 + ... + 336049.

It is an arithmetic number, because the mean of its divisors is an integer number (31213125).

Almost surely, 2^285280825 is an apocalyptic number.

285280825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

285280825 is a deficient number, since it is larger than the sum of its proper divisors (89276675).

285280825 is a wasteful number, since it uses less digits than its factorization.

285280825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671276 (or 671271 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 285280825 is about 16890.2582869535. The cubic root of 285280825 is about 658.3005135947.

The spelling of 285280825 in words is "two hundred eighty-five million, two hundred eighty thousand, eight hundred twenty-five".