Alright, let's work through 85436457 times 9942721 step by step
85436457 × 9942721 = 9942721 × (85436457)
+ 9942721 × 7 that equals 69599047
+ 9942721 × 50 that results in 497136050
+ 9942721 × 400 that equals 3977088400
+ 9942721 × 6000 that equals 59656326000
+ 9942721 × 30000 that results in 298281630000
+ 9942721 × 400000 what gives us 3977088400000
+ 9942721 × 5000000 that results in 49713605000000
+ 9942721 × 80000000 which equals 795417680000000

= 849470855179497
