28189019 has 2 divisors, whose sum is σ = 28189020. Its totient is φ = 28189018.

The previous prime is 28189003. The next prime is 28189033. The reversal of 28189019 is 91098182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28189019 - 2⁴ = 28189003 is a prime.

It is a super-2 number, since 2×28189019² = 1589241584364722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28189069) 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, 14094509 + 14094510.

It is an arithmetic number, because the mean of its divisors is an integer number (14094510).

Almost surely, 2^28189019 is an apocalyptic number.

28189019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28189019 is an equidigital number, since it uses as much as digits as its factorization.

28189019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 28189019 is about 5309.3331973045. Note that the first 3 decimals coincide. The cubic root of 28189019 is about 304.3406665494.

The spelling of 28189019 in words is "twenty-eight million, one hundred eighty-nine thousand, nineteen".