With six weeks to go until the presidential election, super PACs have already taken in $1.1 billion in donations, up from $846 billion in 2012, the first White House race in which they were allowed to function.

Approximately half of those funds have come from 62 wealthy benefactors, according to a USA Today analysis released Wednesday evening. The average large gift was $3 million, coming individuals, companies and unions. Donations to super PACs are unlimited, unlike contributions to campaigns themselves. But super PACs and campaigns are not supposed to coordinate.