28088289 has 20 divisors (see below), whose sum is σ = 44169840. Its totient is φ = 17739000.

The previous prime is 28088237. The next prime is 28088293. The reversal of 28088289 is 98288082.

It is not a de Polignac number, because 28088289 - 2⁷ = 28088161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28088219) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7587 + ... + 10664.

It is an arithmetic number, because the mean of its divisors is an integer number (2208492).

Almost surely, 2^28088289 is an apocalyptic number.

It is an amenable number.

28088289 is a deficient number, since it is larger than the sum of its proper divisors (16081551).

28088289 is a wasteful number, since it uses less digits than its factorization.

28088289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18282 (or 18273 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 28088289 is about 5299.8385824476. The cubic root of 28088289 is about 303.9777258899.

The spelling of 28088289 in words is "twenty-eight million, eighty-eight thousand, two hundred eighty-nine".