The CAS Registry Mumber 28728-59-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,7,2 and 8 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 28728-59: (7*2)+(6*8)+(5*7)+(4*2)+(3*8)+(2*5)+(1*9)=148 148 % 10 = 8 So 28728-59-8 is a valid CAS Registry Number.
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