Sum of all divisors of 5400 whose unit digit is 0 is

Sum of all the odd divisors of 720 is

If the number of 6 - digit numbers that contains exactly 3 sevens as digits is M and the sum of all divisors of M is K then find the highest exponent of 6 in K

The number of numbers of 7 digits whose sum of digits is even, is

Number of 7 digit numbers the sum of whose digits is 61 is

Sum of all four digit numbers whose all four digits are prime and non-repected be