Alright, let's work through 87720435 times 55860273 step by step
87720435 × 55860273 = 55860273 × (87720435)
+ 55860273 × 5 that equals 279301365
+ 55860273 × 30 which equals 1675808190
+ 55860273 × 400 resulting in 22344109200
+ 55860273 × 0000 what gives us 0
+ 55860273 × 20000 that results in 1117205460000
+ 55860273 × 700000 resulting in 39102191100000
+ 55860273 × 7000000 resulting in 391021911000000
+ 55860273 × 80000000 resulting in 4468821840000000

= 4900087446778755
