Thousand's - 3 choices (4, 5 and 6); 2 Even and 1 Odd
Hundred's - 10 choices (0, 1, 2 ..., 9); 5 Even and 5 Odd
Ten's - 10 choices (0, 1, 2 ..., 9); 5 Even and 5 Odd
Unit's - 5 choices (0, 2, 4, 6, 8)
Th-Hu-Te-U
even-even-even-even ---> 2*4*3*2 = 48
even-even-odd-even ---> 2*4*5*3 = 120
even-odd-even-even ---> 2*5*4*3 = 120
even-odd-odd-even ----> 2*5*4*4 = 160
odd-even-even-even ----> 1*5*4*3 = 60
odd-even-odd-even -----> 1*5*4*4 = 80
odd-odd-even-even -----> 1*4*5*4 = 80
odd-odd-odd-even ------> 1*4*3*5 = 60
Sum = 728