28044288 has 132 divisors (see below), whose sum is σ = 86219640. Its totient is φ = 8749056.

The previous prime is 28044277. The next prime is 28044301. The reversal of 28044288 is 88244082.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 156583 + ... + 156761.

Almost surely, 2^28044288 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 28044288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43109820).

28044288 is an abundant number, since it is smaller than the sum of its proper divisors (58175352).

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

28044288 is a wasteful number, since it uses less digits than its factorization.

28044288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 28044288 is about 5295.6857912833. The cubic root of 28044288 is about 303.8189133891.

The spelling of 28044288 in words is "twenty-eight million, forty-four thousand, two hundred eighty-eight".