Alright, let's work through 56099917 times 78721527 step by step
56099917 × 78721527 = 78721527 × (56099917)
+ 78721527 × 7 that equals 551050689
+ 78721527 × 10 that equals 787215270
+ 78721527 × 900 resulting in 70849374300
+ 78721527 × 9000 which equals 708493743000
+ 78721527 × 90000 that results in 7084937430000
+ 78721527 × 000000 giving us 0
+ 78721527 × 6000000 that results in 472329162000000
+ 78721527 × 50000000 that equals 3936076350000000

= 4416271130813259
