Alright, let's work through 80486978 times 69838398 step by step
80486978 × 69838398 = 69838398 × (80486978)
+ 69838398 × 8 giving us 558707184
+ 69838398 × 70 resulting in 4888687860
+ 69838398 × 900 that is equal 62854558200
+ 69838398 × 6000 which equals 419030388000
+ 69838398 × 80000 producing 5587071840000
+ 69838398 × 400000 that is equal 27935359200000
+ 69838398 × 0000000 which equals 0
+ 69838398 × 80000000 that is equal 5587071840000000

= 5621081603381244
