28928128 has 16 divisors (see below), whose sum is σ = 57630510. Its totient is φ = 14464000.

The previous prime is 28928111. The next prime is 28928129. The reversal of 28928128 is 82182982.

It can be written as a sum of positive squares in only one way, i.e., 26132544 + 2795584 = 5112^2 + 1672^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (28928129) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112873 + ... + 113128.

Almost surely, 2^28928128 is an apocalyptic number.

It is an amenable number.

28928128 is a deficient number, since it is larger than the sum of its proper divisors (28702382).

28928128 is an equidigital number, since it uses as much as digits as its factorization.

28928128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226015 (or 226003 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 28928128 is about 5378.4875197401. The cubic root of 28928128 is about 306.9776639205.

The spelling of 28928128 in words is "twenty-eight million, nine hundred twenty-eight thousand, one hundred twenty-eight".