Giuseppe Melfi (June 11, 1967) is an Italo-Swiss mathematician who works on practical numbers and modular forms.

His major contributions are in the field of practical numbers.

The second one is that there exist infinitely many triples of practical numbers of the form

He also proved that there exist infinitely many Fibonacci numbers that are practicals[3] Another notable contribution has been in an application of the theory of modular forms, where he found new Ramanujan-type identities for the sum-of-divisor functions.

Since 2019, with a 14712-digits primitive weird number, he shares this record, with a team of collaborators.

[5] In applied mathematics his research interests include probability and simulation.