5760x3840 is twenty-two megapixels. That's plenty. The PPI value is meaningless.
However, it might indicate that your files are jpegs? If so, that would be very bad.
Good. So there is no actual problem with the file, apart from the fact that you have neglected the noise removal. Please never neglect that, ever.
Please do it now, then tell me if the "problem" still exists when you open the file into Photoshop.