Alright, let's work through 80677345 times 83629788 step by step
80677345 × 83629788 = 83629788 × (80677345)
+ 83629788 × 5 giving us 418148940
+ 83629788 × 40 yielding 3345191520
+ 83629788 × 300 which equals 25088936400
+ 83629788 × 7000 resulting in 585408516000
+ 83629788 × 70000 that is equal 5854085160000
+ 83629788 × 600000 which equals 50177872800000
+ 83629788 × 0000000 that equals 0
+ 83629788 × 80000000 that results in 6690383040000000

= 6747029258752860
