28866193 has 2 divisors, whose sum is σ = 28866194. Its totient is φ = 28866192.

The previous prime is 28866191. The next prime is 28866197. The reversal of 28866193 is 39166882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28804689 + 61504 = 5367^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 28866193 - 2¹ = 28866191 is a prime.

Together with 28866191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28866191) 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 as a sum of consecutive naturals, namely, 14433096 + 14433097.

It is an arithmetic number, because the mean of its divisors is an integer number (14433097).

Almost surely, 2^28866193 is an apocalyptic number.

It is an amenable number.

28866193 is a deficient number, since it is larger than the sum of its proper divisors (1).

28866193 is an equidigital number, since it uses as much as digits as its factorization.

28866193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 28866193 is about 5372.7267751115. The cubic root of 28866193 is about 306.7584280905.

The spelling of 28866193 in words is "twenty-eight million, eight hundred sixty-six thousand, one hundred ninety-three".