28244216 has 64 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 10154880.

The previous prime is 28244201. The next prime is 28244219. The reversal of 28244216 is 61244282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28244219) 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, 6245 + ... + 9771.

It is an arithmetic number, because the mean of its divisors is an integer number (1111320).

Almost surely, 2^28244216 is an apocalyptic number.

28244216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28244216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

28244216 is an abundant number, since it is smaller than the sum of its proper divisors (42880264).

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

28244216 is a wasteful number, since it uses less digits than its factorization.

28244216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564 (or 3560 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 28244216 is about 5314.5287655633. The cubic root of 28244216 is about 304.5391804833.

Adding to 28244216 its reverse (61244282), we get a palindrome (89488498).

The spelling of 28244216 in words is "twenty-eight million, two hundred forty-four thousand, two hundred sixteen".