28044289 has 32 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 21183552.

The previous prime is 28044277. The next prime is 28044301. The reversal of 28044289 is 98244082.

It is an interprime number because it is at equal distance from previous prime (28044277) and next prime (28044301).

It is not a de Polignac number, because 28044289 - 2⁹ = 28043777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28044239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337842 + ... + 337924.

It is an arithmetic number, because the mean of its divisors is an integer number (1128960).

Almost surely, 2^28044289 is an apocalyptic number.

It is an amenable number.

28044289 is a deficient number, since it is larger than the sum of its proper divisors (8082431).

28044289 is a wasteful number, since it uses less digits than its factorization.

28044289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28044289 is about 5295.6858856998. The cubic root of 28044289 is about 303.8189170003.

The spelling of 28044289 in words is "twenty-eight million, forty-four thousand, two hundred eighty-nine".