The CAS Registry Mumber 58792-17-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,7,9 and 2 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 58792-17: (7*5)+(6*8)+(5*7)+(4*9)+(3*2)+(2*1)+(1*7)=169 169 % 10 = 9 So 58792-17-9 is a valid CAS Registry Number.