That's the same as the square root of 729, multiplied by i - where "i" is the so-called "imaginary unit".
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27, -27
The square root of 729 is 27 and as a product of its prime factors in exponents it is 36
sqrt(27) + 729 = 734.20, approx.
729 does not have "a square root of 3 times 3 times 3 times 327" so the question does not arise. 729 is a square number with a square root of 3 x 3 x 3 because (3 x 3 x 3) x (3 x 3 x 3) = 729
The cube root of 729 is 9.