28222344 has 80 divisors (see below), whose sum is σ = 80041500. Its totient is φ = 9289728.

The previous prime is 28222331. The next prime is 28222349. The reversal of 28222344 is 44322282.

It can be written as a sum of positive squares in 2 ways, for example, as 28196100 + 26244 = 5310^2 + 162^2 .

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222349) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 62632 + ... + 63080.

Almost surely, 2^28222344 is an apocalyptic number.

28222344 is a gapful number since it is divisible by the number (24) 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 28222344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40020750).

28222344 is an abundant number, since it is smaller than the sum of its proper divisors (51819156).

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

28222344 is a wasteful number, since it uses less digits than its factorization.

28222344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 551 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 28222344 is about 5312.4706116834. The cubic root of 28222344 is about 304.4605496223.

The spelling of 28222344 in words is "twenty-eight million, two hundred twenty-two thousand, three hundred forty-four".