28289536 has 40 divisors (see below), whose sum is σ = 61674624. Its totient is φ = 12856320.

The previous prime is 28289531. The next prime is 28289539. The reversal of 28289536 is 63598282.

It is a junction number, because it is equal to n+sod(n) for n = 28289492 and 28289501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3121 + ... + 8143.

Almost surely, 2^28289536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28289536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30837312).

28289536 is an abundant number, since it is smaller than the sum of its proper divisors (33385088).

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

28289536 is an equidigital number, since it uses as much as digits as its factorization.

28289536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5052 (or 5036 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 28289536 is about 5318.7908400312. The cubic root of 28289536 is about 304.7019788920.

The spelling of 28289536 in words is "twenty-eight million, two hundred eighty-nine thousand, five hundred thirty-six".