28203285 has 48 divisors (see below), whose sum is σ = 50944320. Its totient is φ = 13305600.

The previous prime is 28203281. The next prime is 28203319. The reversal of 28203285 is 58230282.

It is not a de Polignac number, because 28203285 - 2² = 28203281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28203281) 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 47 ways as a sum of consecutive naturals, for example, 74226 + ... + 74604.

It is an arithmetic number, because the mean of its divisors is an integer number (1061340).

Almost surely, 2^28203285 is an apocalyptic number.

It is an amenable number.

28203285 is a deficient number, since it is larger than the sum of its proper divisors (22741035).

28203285 is a wasteful number, since it uses less digits than its factorization.

28203285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28203285 is about 5310.6765105775. The cubic root of 28203285 is about 304.3919984969.

It can be divided in two parts, 2820 and 3285, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 28203285 in words is "twenty-eight million, two hundred three thousand, two hundred eighty-five".