28276128 has 60 divisors (see below), whose sum is σ = 83166930. Its totient is φ = 9424512.

The previous prime is 28276121. The next prime is 28276139. The reversal of 28276128 is 82167282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26501904 + 1774224 = 5148^2 + 1332^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28276092 and 28276101.

It is not an unprimeable number, because it can be changed into a prime (28276121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2863 + ... + 8046.

Almost surely, 2^28276128 is an apocalyptic number.

It is an amenable number.

28276128 is an abundant number, since it is smaller than the sum of its proper divisors (54890802).

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

28276128 is a wasteful number, since it uses less digits than its factorization.

28276128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10931 (or 10914 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28276128 is about 5317.5302537926. The cubic root of 28276128 is about 304.6538328244.

The spelling of 28276128 in words is "twenty-eight million, two hundred seventy-six thousand, one hundred twenty-eight".