28103128 has 48 divisors (see below), whose sum is σ = 57332880. Its totient is φ = 12902976.

The previous prime is 28103111. The next prime is 28103177. The reversal of 28103128 is 82130182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106725 + ... + 106987.

It is an arithmetic number, because the mean of its divisors is an integer number (1194435).

Almost surely, 2^28103128 is an apocalyptic number.

It is an amenable number.

28103128 is an abundant number, since it is smaller than the sum of its proper divisors (29229752).

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

28103128 is a wasteful number, since it uses less digits than its factorization.

28103128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28103128 is about 5301.2383458962. The cubic root of 28103128 is about 304.0312467882.

The spelling of 28103128 in words is "twenty-eight million, one hundred three thousand, one hundred twenty-eight".