One more comment on the term "numero sano". This term was used extensively by Luca Pacioli in his "Summa". Before Pacioli, it was already used by Piero della Francesca in his "Trattato d'abaco". I also find it in the second edition of Pietro Cataneo's "Le pratiche delle due prime matematiche" of 1567. I haven't seen the first edition.
Counting also Fibonacci's Latin "numerus sanus", the word "sano" was used for at least 350 years to denote an integral (untouched, virginal) number.
Besides the words "sanus", "sano", the words "integer", "intero", "intiero" were also used during that time.