Find the difference between the number $279$ and that obtained on reversing its digits.

Arrange the following numbers in ascending order:

$102345694,8354208,6539542,63547201,12345678$

Arrange the following numbers in ascending order:

$1808090,1808088,181888,190909,16060666$

Arrange the following numbers in descending order:

$56943300,56943201,5695440,56944000,5694437$

Arrange the following numbers in descending order:

$1020216,1020308,1021430,893245,893425$