"2" because 4*4= 16 4*4*4=64, that is to say, the unit number 4*6 of 4* 16 is 4, from which it can be inferred that the last number of 2004 to the power of 2005 is 4; 8 * 8 = 648 * 4 = 328 * 2 =168 * 6 = 488 * 8 = 64. It can be concluded that the square digit of 2008 is 4, the fourth digit of 2008 is 8, and the fifth digit of 2008 is 4, so the digits of 2007 in 2008 are 6,,,.