28944289 has 12 divisors (see below), whose sum is σ = 32560528. Its totient is φ = 25696440.

The previous prime is 28944283. The next prime is 28944299. The reversal of 28944289 is 98244982.

It is not a de Polignac number, because 28944289 - 2¹¹ = 28942241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28944283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2422 + ... + 7984.

Almost surely, 2^28944289 is an apocalyptic number.

It is an amenable number.

28944289 is a deficient number, since it is larger than the sum of its proper divisors (3616239).

28944289 is a wasteful number, since it uses less digits than its factorization.

28944289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628 (or 5617 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 28944289 is about 5379.9896840050. The cubic root of 28944289 is about 307.0348187015.

The spelling of 28944289 in words is "twenty-eight million, nine hundred forty-four thousand, two hundred eighty-nine".