28500228 has 144 divisors (see below), whose sum is σ = 84490560. Its totient is φ = 8273664.

The previous prime is 28500163. The next prime is 28500239. The reversal of 28500228 is 82200582.

It is a super-3 number, since 3×28500228³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 662775 + ... + 662817.

It is an arithmetic number, because the mean of its divisors is an integer number (586740).

Almost surely, 2^28500228 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 28500228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42245280).

28500228 is an abundant number, since it is smaller than the sum of its proper divisors (55990332).

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

28500228 is a wasteful number, since it uses less digits than its factorization.

28500228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 28500228 is about 5338.5604801295. The cubic root of 28500228 is about 305.4565517609.

The spelling of 28500228 in words is "twenty-eight million, five hundred thousand, two hundred twenty-eight".