28289851 has 4 divisors (see below), whose sum is σ = 28769400. Its totient is φ = 27810304.

The previous prime is 28289831. The next prime is 28289857. The reversal of 28289851 is 15898282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15898282 = 2 ⋅7949141.

It is a cyclic number.

It is not a de Polignac number, because 28289851 - 2¹¹ = 28287803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28289798 and 28289807.

It is not an unprimeable number, because it can be changed into a prime (28289857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239686 + ... + 239803.

It is an arithmetic number, because the mean of its divisors is an integer number (7192350).

Almost surely, 2^28289851 is an apocalyptic number.

28289851 is a deficient number, since it is larger than the sum of its proper divisors (479549).

28289851 is an equidigital number, since it uses as much as digits as its factorization.

28289851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479548.

The product of its digits is 92160, while the sum is 43.

The square root of 28289851 is about 5318.8204519423. The cubic root of 28289851 is about 304.7031098257.

The spelling of 28289851 in words is "twenty-eight million, two hundred eighty-nine thousand, eight hundred fifty-one".