From the 1960s onward, his romances often overshadowed his professional life. There were great loves (Joan Collins, Natalie Wood, Julie Christie, Diane Keaton) and many, many shorter trysts, from Cher to Madonna. He insists there is wild hyperbole in his reputation as a manslut and disputes the mathematics of the 12,775 women one of his biographers, Peter Biskind, has claimed for him. "Think about it, sleeping with 12,775 people," he says, not without a certain amount of glee. "That would mean not just that there were multiple people a day, but that there was no repetition."
From an AARP piece on Warren Beatty
12,775/365 = 35 Exactly 35! Someone probably figured that 35 is the number of years between when Beatty became "a man" at 18 and when he became a husband at 54. One different woman every. single. day. Yeah, not likely, but very likly that is where the number came from.