If we multiply a fraction by itself and divide the product so obtained by its reciprocal, then the fraction so obtained is . The original fraction is :

The sum of five consecutive multiples of 8 is 560. The smallest multiple is

A two-digit number is 4 times the sum of its digits and twice the product of the digits. The number is:

​The product of the predecessor of 201 and the successor of 4781 is:​

How many factors does the number 12288 have?

$$4^7-4$$​ is NOT a multiple of:

How many factors of $$2^7×3^4×5^3×7$$​ are even?