In the five digit number 1b6a3, a is the greatest single digit perfect cube and twice of it exceeds b by 7. Then the sum of the number and its cube root is ____.
A 18700
B 11862
C 19710
D 25320
In the five digit number 1b6a3, a is the greatest single digit perfect cube and twice of it exceeds b by 7. Then the sum of the number and its cube root is ____.
A 18700
B 11862
C 19710
D 25320