which number has its place value and face value same, whenever it is placed in a numeral

There isn't any particular number whose face and place value are same.

Although the digits used in a given number may have same place and face value.

For example,  consider a number 3,456.

Here, place value of 6 = 6 × ones = 6 × 1 = 6

and we know that face value of a number is the number itself.

Therefore, face value of 6 in the number 3,456 is equal to 6.