28224216 has 48 divisors (see below), whose sum is σ = 80940600. Its totient is φ = 8854272.

The previous prime is 28224191. The next prime is 28224223. The reversal of 28224216 is 61242282.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28224216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10306 + ... + 12753.

Almost surely, 2^28224216 is an apocalyptic number.

It is an amenable number.

28224216 is an abundant number, since it is smaller than the sum of its proper divisors (52716384).

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

28224216 is a wasteful number, since it uses less digits than its factorization.

28224216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23088 (or 23081 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 28224216 is about 5312.6467979718. The cubic root of 28224216 is about 304.4672811391.

Adding to 28224216 its reverse (61242282), we get a palindrome (89466498).

The spelling of 28224216 in words is "twenty-eight million, two hundred twenty-four thousand, two hundred sixteen".