28189069 has 2 divisors, whose sum is σ = 28189070. Its totient is φ = 28189068.

The previous prime is 28189033. The next prime is 28189151. The reversal of 28189069 is 96098182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22610025 + 5579044 = 4755^2 + 2362^2 .

It is a cyclic number.

It is not a de Polignac number, because 28189069 - 2¹¹ = 28187021 is a prime.

It is a super-2 number, since 2×28189069² = 1589247222173522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28189019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094534 + 14094535.

It is an arithmetic number, because the mean of its divisors is an integer number (14094535).

Almost surely, 2^28189069 is an apocalyptic number.

It is an amenable number.

28189069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28189069 is an equidigital number, since it uses as much as digits as its factorization.

28189069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28189069 is about 5309.3379059917. The cubic root of 28189069 is about 304.3408464897.

The spelling of 28189069 in words is "twenty-eight million, one hundred eighty-nine thousand, sixty-nine".