5638-40-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 5638-40-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,6,3 and 8 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 5638-40:
(6*5)+(5*6)+(4*3)+(3*8)+(2*4)+(1*0)=104
104 % 10 = 4
So 5638-40-4 is a valid CAS Registry Number.