28881344 has 28 divisors (see below), whose sum is σ = 58012584. Its totient is φ = 14264064.

The previous prime is 28881323. The next prime is 28881379. The reversal of 28881344 is 44318882.

It is a junction number, because it is equal to n+sod(n) for n = 28881298 and 28881307.

It is a congruent number.

It is an unprimeable number.

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, 2594 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (2071878).

Almost surely, 2^28881344 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 28881344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29006292).

28881344 is an abundant number, since it is smaller than the sum of its proper divisors (29131240).

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

28881344 is an equidigital number, since it uses as much as digits as its factorization.

28881344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532 (or 5522 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 28881344 is about 5374.1365818148. The cubic root of 28881344 is about 306.8120881400.

The spelling of 28881344 in words is "twenty-eight million, eight hundred eighty-one thousand, three hundred forty-four".