①二十七亿八千万八千二百六十写作:2780008260,
27 8000 8260=27.8000826亿;
②五十三亿四千九百三十三写作:5300004933,
5300004933=53.00004933亿;
③五亿零九十万三千七百八十写作:500903780,
500903780=5.0090378亿;
④五百亿七千万六千写作:50070006000,50070006000=500.70006亿;
故答案为:2780008260,27.8000826亿;5300004933,53.00004933亿;500903780,5.0090378亿;50070006000,500.70006亿.