PITTSBURGH — The Pittsburgh Penguins’ Stanley Cup championship, the first an NHL team has won back to back in almost 20 years, spawned by far the biggest victory parade of any of the franchise’s five titles.

An estimated 650,000 people turned out along a downtown parade route that ended with a rally at Point State Park, city public works and public safety officials said Wednesday.

A sunny day with temperatures in the 80s didn’t hurt, as the smell of sunscreen was as pungent as the Penguins’ love in a city that boasts, officially, only 305,000 residents.

“These guys are fierce competitors,” coach Mike Sullivan told the crowd from a stage in the triangular park formed by the confluence of the city’s three rivers. “They just know how to win.”

The Penguins won the cup Sunday against the Nashville Predators with a 2-0 win in Game 6.

And judging from signs and chants from the crowd, this championship was sweetened by the adversity the team overcame.

Playoff MVP and Penguins captain Sidney Crosby was knocked out for the better part of two games with a concussion against the Washington Capitals, and the Penguins played without their best defenseman, Kris Letang, who had neck surgery before the playoffs.

As the players took the stage to PPG Paints Arena announcer Ryan Mill’s introductions, fans also learned that Ian Cole, another defenseman, played through a broken hand and broken ribs. And Brian Bonino, who broke his leg blocking a shot but still finished Game 2 of the finals before missing the rest, hobbled around on crutches while taking selfies with fans.

A couple of bittersweet story lines punctuated the festivities: 40-year-old veteran Matt Cullen, who has won two Cups since joining the Penguins as a free agent last season, has hinted he might retire, prompting fans to chant, “One more year!”

And, perhaps the best story of the playoffs was how former starting goalie Marc-Andre Fleury regained that job when rookie Matt Murray was injured during warm-ups in the first game of the playoffs.

Fleury was in net for nine of the 16 victories the Penguins needed to win the Cup before Murray returned. Fleury, one of the most popular Penguins with fans and teammates, is likely to leave when the new Las Vegas franchise drafts its players or in an offseason trade.