Because the digital position of two numbers has changed, but the sum of each number remains the same, so their sum should be even.

172535, 1+7+2+5+3+5=23 odd numbers.

56874 1, 5+6+8+7+4+ 1 = 3 1 odd number

620708, 6+2+0+7+0+8=23 odd number

845267, 8+4+5+2+6+7=32 even number.