Alright, let's work through 5664747 times 90631148 step by step
5664747 × 90631148 = 90631148 × (5664747)
+ 90631148 × 7 giving us 634418036
+ 90631148 × 40 which equals 3625245920
+ 90631148 × 700 producing 63441803600
+ 90631148 × 4000 giving us 362524592000
+ 90631148 × 60000 that equals 5437868880000
+ 90631148 × 600000 giving us 54378688800000
+ 90631148 × 5000000 that results in 453155740000000

= 513402523739556
