28828289 has 8 divisors (see below), whose sum is σ = 33750528. Its totient is φ = 24107040.

The previous prime is 28828279. The next prime is 28828309. The reversal of 28828289 is 98282882.

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

It is a cyclic number.

It is not a de Polignac number, because 28828289 - 2⁴ = 28828273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28828259) 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 7 ways as a sum of consecutive naturals, for example, 49937 + ... + 50510.

It is an arithmetic number, because the mean of its divisors is an integer number (4218816).

Almost surely, 2^28828289 is an apocalyptic number.

It is an amenable number.

28828289 is a deficient number, since it is larger than the sum of its proper divisors (4922239).

28828289 is a wasteful number, since it uses less digits than its factorization.

28828289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100495.

The product of its digits is 294912, while the sum is 47.

The square root of 28828289 is about 5369.1981710494. The cubic root of 28828289 is about 306.6241018166.

The spelling of 28828289 in words is "twenty-eight million, eight hundred twenty-eight thousand, two hundred eighty-nine".