28044144 has 60 divisors (see below), whose sum is σ = 81402776. Its totient is φ = 9346752.

The previous prime is 28044139. The next prime is 28044151. The reversal of 28044144 is 44144082.

It is a happy number.

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

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, 282 + ... + 7494.

Almost surely, 2^28044144 is an apocalyptic number.

28044144 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 28044144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40701388).

28044144 is an abundant number, since it is smaller than the sum of its proper divisors (53358632).

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

28044144 is an equidigital number, since it uses as much as digits as its factorization.

28044144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7236 (or 7218 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 28044144 is about 5295.6721952931. The cubic root of 28044144 is about 303.8183933783.

The spelling of 28044144 in words is "twenty-eight million, forty-four thousand, one hundred forty-four".