28009285 has 16 divisors (see below), whose sum is σ = 37138176. Its totient is φ = 20171008.

The previous prime is 28009231. The next prime is 28009291. The reversal of 28009285 is 58290082.

It is a cyclic number.

It is not a de Polignac number, because 28009285 - 2¹³ = 28001093 is a prime.

It is a super-2 number, since 2×28009285² = 1569040092422450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28009285.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5209 + ... + 9118.

It is an arithmetic number, because the mean of its divisors is an integer number (2321136).

Almost surely, 2^28009285 is an apocalyptic number.

It is an amenable number.

28009285 is a deficient number, since it is larger than the sum of its proper divisors (9128891).

28009285 is a wasteful number, since it uses less digits than its factorization.

28009285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14372.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28009285 is about 5292.3798994403. The cubic root of 28009285 is about 303.6924586312.

The spelling of 28009285 in words is "twenty-eight million, nine thousand, two hundred eighty-five".