28366728 has 128 divisors (see below), whose sum is σ = 82252800. Its totient is φ = 8084736.

The previous prime is 28366721. The next prime is 28366763. The reversal of 28366728 is 82766382.

It is a self number, because there is not a number n which added to its sum of digits gives 28366728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28366721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423351 + ... + 423417.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^28366728 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 28366728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41126400).

28366728 is an abundant number, since it is smaller than the sum of its proper divisors (53886072).

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

28366728 is a wasteful number, since it uses less digits than its factorization.

28366728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 167 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 28366728 is about 5326.0424331768. The cubic root of 28366728 is about 304.9788680154.

The spelling of 28366728 in words is "twenty-eight million, three hundred sixty-six thousand, seven hundred twenty-eight".