Alright, let's work through 90655605 times 79890578 step by step
90655605 × 79890578 = 79890578 × (90655605)
+ 79890578 × 5 that results in 399452890
+ 79890578 × 00 that is equal 0
+ 79890578 × 600 what gives us 47934346800
+ 79890578 × 5000 which equals 399452890000
+ 79890578 × 50000 resulting in 3994528900000
+ 79890578 × 600000 that equals 47934346800000
+ 79890578 × 0000000 that results in 0
+ 79890578 × 90000000 that equals 7190152020000000

= 7242528682389690
