28285803 has 24 divisors (see below), whose sum is σ = 50287328. Its totient is φ = 14919552.

The previous prime is 28285801. The next prime is 28285811. The reversal of 28285803 is 30858282.

It is not a de Polignac number, because 28285803 - 2¹ = 28285801 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28285801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16450 + ... + 18087.

Almost surely, 2^28285803 is an apocalyptic number.

28285803 is a deficient number, since it is larger than the sum of its proper divisors (22001525).

28285803 is a wasteful number, since it uses less digits than its factorization.

28285803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34563 (or 34560 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28285803 is about 5318.4399028286. The cubic root of 28285803 is about 304.6885757911.

It can be divided in two parts, 282 and 85803, that multiplied together give a triangular number (24196446 = T₆₉₅₆).

The spelling of 28285803 in words is "twenty-eight million, two hundred eighty-five thousand, eight hundred three".