Power output of the sun

From the relation:

P = ??AT4 where ? = 5.67 x 10-8 m2 *K4

and the size of the sun (radius = 700,000 km = 7 x 108 m; A = area = 4?r2 = 6 x 1018m2), we get: P = (1) * (5.67 x 10-8 m2K4) (6x1018m2) * (6000K)4 ? 4 x 1026 Watts.

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