Alright, let's work through 85879758 times 80491034 step by step
85879758 × 80491034 = 80491034 × (85879758)
+ 80491034 × 8 what gives us 643928272
+ 80491034 × 50 resulting in 4024551700
+ 80491034 × 700 what gives us 56343723800
+ 80491034 × 9000 that results in 724419306000
+ 80491034 × 70000 yielding 5634372380000
+ 80491034 × 800000 that is equal 64392827200000
+ 80491034 × 5000000 that equals 402455170000000
+ 80491034 × 80000000 resulting in 6439282720000000

= 6912550521089772
