28004289 has 8 divisors (see below), whose sum is σ = 37408320. Its totient is φ = 18634896.

The previous prime is 28004281. The next prime is 28004293. The reversal of 28004289 is 98240082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28004289 - 2³ = 28004281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28004281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6709 + ... + 10050.

It is an arithmetic number, because the mean of its divisors is an integer number (4676040).

Almost surely, 2^28004289 is an apocalyptic number.

It is an amenable number.

28004289 is a deficient number, since it is larger than the sum of its proper divisors (9404031).

28004289 is a wasteful number, since it uses less digits than its factorization.

28004289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17319.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28004289 is about 5291.9078790168. The cubic root of 28004289 is about 303.6744010747.

The spelling of 28004289 in words is "twenty-eight million, four thousand, two hundred eighty-nine".