28732189 has 2 divisors, whose sum is σ = 28732190. Its totient is φ = 28732188.

The previous prime is 28732169. The next prime is 28732219. The reversal of 28732189 is 98123782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 24025 = 5358^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 28732189 - 2⁵ = 28732157 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 (28732139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14366094 + 14366095.

It is an arithmetic number, because the mean of its divisors is an integer number (14366095).

Almost surely, 2^28732189 is an apocalyptic number.

It is an amenable number.

28732189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28732189 is an equidigital number, since it uses as much as digits as its factorization.

28732189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 28732189 is about 5360.2415057533. The cubic root of 28732189 is about 306.2830088535.

The spelling of 28732189 in words is "twenty-eight million, seven hundred thirty-two thousand, one hundred eighty-nine".