28189643 has 2 divisors, whose sum is σ = 28189644. Its totient is φ = 28189642.

The previous prime is 28189619. The next prime is 28189657. The reversal of 28189643 is 34698182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28189643 - 2¹⁰ = 28188619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28189643.

It is not a weakly prime, because it can be changed into another prime (28189243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094821 + 14094822.

It is an arithmetic number, because the mean of its divisors is an integer number (14094822).

Almost surely, 2^28189643 is an apocalyptic number.

28189643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28189643 is an equidigital number, since it uses as much as digits as its factorization.

28189643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 28189643 is about 5309.3919614208. The cubic root of 28189643 is about 304.3429121895.

The spelling of 28189643 in words is "twenty-eight million, one hundred eighty-nine thousand, six hundred forty-three".