Alright, let's work through 83426987 times 52980789 step by step
83426987 × 52980789 = 52980789 × (83426987)
+ 52980789 × 7 giving us 370865523
+ 52980789 × 80 what gives us 4238463120
+ 52980789 × 900 that results in 47682710100
+ 52980789 × 6000 yielding 317884734000
+ 52980789 × 20000 that equals 1059615780000
+ 52980789 × 400000 that equals 21192315600000
+ 52980789 × 3000000 that equals 158942367000000
+ 52980789 × 80000000 yielding 4238463120000000

= 4420027595152743
