28305585 has 96 divisors (see below), whose sum is σ = 64022400. Its totient is φ = 11733120.

The previous prime is 28305583. The next prime is 28305593. The reversal of 28305585 is 58550382.

It is not a de Polignac number, because 28305585 - 2¹ = 28305583 is a prime.

It is a super-3 number, since 3×28305585³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28305581) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 72571 + ... + 72959.

It is an arithmetic number, because the mean of its divisors is an integer number (666900).

Almost surely, 2^28305585 is an apocalyptic number.

It is an amenable number.

28305585 is an abundant number, since it is smaller than the sum of its proper divisors (35716815).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28305585 is a wasteful number, since it uses less digits than its factorization.

28305585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 28305585 is about 5320.2993336841. The cubic root of 28305585 is about 304.7595883865.

The spelling of 28305585 in words is "twenty-eight million, three hundred five thousand, five hundred eighty-five".