28222784 has 28 divisors (see below), whose sum is σ = 56802528. Its totient is φ = 13910400.

The previous prime is 28222783. The next prime is 28222819. The reversal of 28222784 is 48722282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439 + ... + 7649.

Almost surely, 2^28222784 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 28222784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28401264).

28222784 is an abundant number, since it is smaller than the sum of its proper divisors (28579744).

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

28222784 is an equidigital number, since it uses as much as digits as its factorization.

28222784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6294 (or 6284 counting only the distinct ones).

The product of its digits is 28672, while the sum is 35.

The square root of 28222784 is about 5312.5120235158. The cubic root of 28222784 is about 304.4621318432.

It can be divided in two parts, 2822278 and 4, that added together give a palindrome (2822282).

The spelling of 28222784 in words is "twenty-eight million, two hundred twenty-two thousand, seven hundred eighty-four".