What is the advantage of using octal number system in computers?

When dealing with large quantity of binary numbers of many bits, it is easy and more efficient for us to write the numbers in octal form. This system is used to express large numbers as used in computers e.g. 16 bits or 32 bits used to express data, memory address, instruction code, processor status etc. Moreover, octal multiplication and division are more easy than the hexadecimal number system. As they are complex because they make use of alphabets 'A' to 'F' after 0 to 9. -