Short answers, pulled from the story.
Alfred Hitchcock acquired the rights to Robert Bloch's 1959 novel for $9,500 in 1960. He financed the project himself through his Shamley Productions company because Paramount Pictures executives refused his usual budget.
Filming began on the 11th of November 1959 when the final budget reached exactly $806,947. The entire production wrapped on the 1st of February 1960 after less than three months of shooting.
Hitchcock employed a chocolate syrup mixture to simulate blood flowing down the drain during the shower sequence. He used forty-five camera setups and ensured no single shot showed more than one second of the knife entering flesh to satisfy censors who banned explicit gore.
The British Board of Film Classification required cuts to stabbing sounds and visible nude shots upon release while New Zealand censors demanded removal of Norman washing blood from his hands. Ireland initially banned the entire picture in 1960 and Singapore removed the murder of Arbogast and a shot of Norman's mother's corpse entirely.
Alfred Hitchcock personally earned in excess of fifteen million dollars from the production profits. He swapped rights to Psycho and his television anthology for one hundred fifty thousand shares of MCA stock which made him the third largest shareholder in MCA Inc.