28367189 has 2 divisors, whose sum is σ = 28367190. Its totient is φ = 28367188.

The previous prime is 28367177. The next prime is 28367219. The reversal of 28367189 is 98176382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22486564 + 5880625 = 4742^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 28367189 - 2⁴ = 28367173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28367389) 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, 14183594 + 14183595.

It is an arithmetic number, because the mean of its divisors is an integer number (14183595).

Almost surely, 2^28367189 is an apocalyptic number.

It is an amenable number.

28367189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28367189 is an equidigital number, since it uses as much as digits as its factorization.

28367189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28367189 is about 5326.0857109138. The cubic root of 28367189 is about 304.9805201211.

The spelling of 28367189 in words is "twenty-eight million, three hundred sixty-seven thousand, one hundred eighty-nine".