Alright, let's work through 80857962 times 36618720 step by step
80857962 × 36618720 = 36618720 × (80857962)
+ 36618720 × 2 that results in 73237440
+ 36618720 × 60 that results in 2197123200
+ 36618720 × 900 which equals 32956848000
+ 36618720 × 7000 that is equal 256331040000
+ 36618720 × 50000 what gives us 1830936000000
+ 36618720 × 800000 that results in 29294976000000
+ 36618720 × 0000000 yielding 0
+ 36618720 × 80000000 that results in 2929497600000000

= 2960915070248640
