28986228 has 48 divisors (see below), whose sum is σ = 76440000. Its totient is φ = 9496224.

The previous prime is 28986227. The next prime is 28986253. The reversal of 28986228 is 82268982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28986227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4098 + ... + 8646.

It is an arithmetic number, because the mean of its divisors is an integer number (1592500).

Almost surely, 2^28986228 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 28986228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38220000).

28986228 is an abundant number, since it is smaller than the sum of its proper divisors (47453772).

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

28986228 is a wasteful number, since it uses less digits than its factorization.

28986228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4621 (or 4613 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 28986228 is about 5383.8859571874. The cubic root of 28986228 is about 307.1830404456.

The spelling of 28986228 in words is "twenty-eight million, nine hundred eighty-six thousand, two hundred twenty-eight".