28128448 has 56 divisors (see below), whose sum is σ = 59143392. Its totient is φ = 13246464.

The previous prime is 28128391. The next prime is 28128449. The reversal of 28128448 is 84482182.

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

It is not an unprimeable number, because it can be changed into a prime (28128449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 142686 + ... + 142882.

It is an arithmetic number, because the mean of its divisors is an integer number (1056132).

Almost surely, 2^28128448 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 28128448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29571696).

28128448 is an abundant number, since it is smaller than the sum of its proper divisors (31014944).

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

28128448 is a wasteful number, since it uses less digits than its factorization.

28128448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 319 counting only the distinct ones).

The product of its digits is 32768, while the sum is 37.

The square root of 28128448 is about 5303.6259294939. The cubic root of 28128448 is about 304.1225267864.

The spelling of 28128448 in words is "twenty-eight million, one hundred twenty-eight thousand, four hundred forty-eight".