28288744 has 32 divisors (see below), whose sum is σ = 58443840. Its totient is φ = 12729600.

The previous prime is 28288703. The next prime is 28288747. The reversal of 28288744 is 44788282.

28288744 = T₂₆₄ + T₂₆₅ + ... + T₅₇₂.

It is a self number, because there is not a number n which added to its sum of digits gives 28288744.

It is not an unprimeable number, because it can be changed into a prime (28288747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7504 + ... + 10624.

It is an arithmetic number, because the mean of its divisors is an integer number (1826370).

Almost surely, 2^28288744 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 28288744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29221920).

28288744 is an abundant number, since it is smaller than the sum of its proper divisors (30155096).

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

28288744 is a wasteful number, since it uses less digits than its factorization.

28288744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3237 counting only the distinct ones).

The product of its digits is 229376, while the sum is 43.

The square root of 28288744 is about 5318.7163864978. The cubic root of 28288744 is about 304.6991353646.

The spelling of 28288744 in words is "twenty-eight million, two hundred eighty-eight thousand, seven hundred forty-four".