The number 25^{64} \cdot 64^{25} is the square of a positive integer N. In decimal representation, the sum of the digits of N is
Answer Choices
A. 7
B. 14
C. 21
D. 28
E. 35
The number 25^{64} \cdot 64^{25} is the square of a positive integer N. In decimal representation, the sum of the digits of N is
Answer Choices
A. 7
B. 14
C. 21
D. 28
E. 35