28438028 has 12 divisors (see below), whose sum is σ = 51930480. Its totient is φ = 13600752.

The previous prime is 28438027. The next prime is 28438031. The reversal of 28438028 is 82083482.

It is not an unprimeable number, because it can be changed into a prime (28438027) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 154463 + ... + 154646.

It is an arithmetic number, because the mean of its divisors is an integer number (4327540).

Almost surely, 2^28438028 is an apocalyptic number.

It is an amenable number.

28438028 is a deficient number, since it is larger than the sum of its proper divisors (23492452).

28438028 is a wasteful number, since it uses less digits than its factorization.

28438028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309136 (or 309134 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 28438028 is about 5332.7317577392. The cubic root of 28438028 is about 305.2341765110.

The spelling of 28438028 in words is "twenty-eight million, four hundred thirty-eight thousand, twenty-eight".