Permutations And Combinations

If all the six digit numbers \(x_1\,x_2\,x_3\,x_4\,x_5\,x_6\) with \(0< x_1 < x_2 < x_3 < x_4 < x_5 < x_6\) are arranged in the increasing order, then the sum of the digits in the \(\mathrm{72^{th}}\) number is _____________.