There can be no conversion.
A nanometre is a measure of length in 1-dimensional space while a Kelvin (there is no "degree Kelvin") is a measure of absolute temperature or thermodynamic activity. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
However, if the question is about black-body radiation, the answer is 5520 Kelvin.
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Algebraic Steps / Dimensional Analysis Formula 728 nm*1 m 1000000000 nm=7.28e-7 m
you x it by 10 to the power of -6 as mm is already 10-3 so to get to nm which is 10 -9 you would have to x by 10-6
1 daNm = 10 Nm
The prefix h- is for hecto- meaning 102. The prefix n- is for nano- meaning 10-9:(0.0000521 hm)* (102 m / hm) / (10-9 m / nm) = 0.0000521 x 1011 nm =5.21 x 106 nm or 5,210,000 nm
If you mean nanometer, that's abbreviated "nm" (lowercase), and the answer is a million.