28564187 has 2 divisors, whose sum is σ = 28564188. Its totient is φ = 28564186.

The previous prime is 28564171. The next prime is 28564189. The reversal of 28564187 is 78146582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28564187 - 2⁴ = 28564171 is a prime.

Together with 28564189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28564189) 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 as a sum of consecutive naturals, namely, 14282093 + 14282094.

It is an arithmetic number, because the mean of its divisors is an integer number (14282094).

Almost surely, 2^28564187 is an apocalyptic number.

28564187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28564187 is an equidigital number, since it uses as much as digits as its factorization.

28564187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 28564187 is about 5344.5474083406. The cubic root of 28564187 is about 305.6848785813.

The spelling of 28564187 in words is "twenty-eight million, five hundred sixty-four thousand, one hundred eighty-seven".