28009135 has 48 divisors (see below), whose sum is σ = 44979840. Its totient is φ = 16511040.

The previous prime is 28009123. The next prime is 28009139. The reversal of 28009135 is 53190082.

It is not a de Polignac number, because 28009135 - 2⁵ = 28009103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28009139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50932 + ... + 51478.

It is an arithmetic number, because the mean of its divisors is an integer number (937080).

Almost surely, 2^28009135 is an apocalyptic number.

28009135 is a deficient number, since it is larger than the sum of its proper divisors (16970705).

28009135 is a wasteful number, since it uses less digits than its factorization.

28009135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 28009135 is about 5292.3657281031. The cubic root of 28009135 is about 303.6919165020.

It can be divided in two parts, 280091 and 35, that added together give a triangular number (280126 = T₇₄₈).

The spelling of 28009135 in words is "twenty-eight million, nine thousand, one hundred thirty-five".