28105284 has 24 divisors (see below), whose sum is σ = 69437088. Its totient is φ = 8817280.

The previous prime is 28105283. The next prime is 28105289. The reversal of 28105284 is 48250182.

It is not an unprimeable number, because it can be changed into a prime (28105283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68682 + ... + 69089.

It is an arithmetic number, because the mean of its divisors is an integer number (2893212).

Almost surely, 2^28105284 is an apocalyptic number.

It is an amenable number.

28105284 is an abundant number, since it is smaller than the sum of its proper divisors (41331804).

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

28105284 is a wasteful number, since it uses less digits than its factorization.

28105284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137795 (or 137793 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28105284 is about 5301.4416907102. The cubic root of 28105284 is about 304.0390214222.

The spelling of 28105284 in words is "twenty-eight million, one hundred five thousand, two hundred eighty-four".