1989 can be expressed as the sum of two or more continuous integers such as 1989 = 994 + 995 = 662 + 663 + 664.
Answer the following questions about such 1989.
(1) When 1989 is expressed by the sum of continuous integers among four or more pieces and eight or less, which is the number of continuous integer?
Moreover, what is the largest integer in the continuous integer?
(2) When arranging the continuous integer in small order, the integer in the middle was 51.
What is the largest integer at this time?
(3) When the number of the continuous integer is 13 pieces and 26 pieces, what is the largest integer, respectively?