Catalyzes the formation of NAD(+) from nicotinamide mononucleotide (NMN) and ATP. Involved in the salvage pathway for NAD(+) biosynthesis via NMN. ATP + beta-nicotinamide D-ribonucleotide + H(+) = diphosphate + NAD(+) Cofactor biosynthesis; NAD(+) biosynthesis; NAD(+) from nicotinamide D-ribonucleotide: step 1/1. Belongs to the eukaryotic NMN adenylyltransferase family. POF1 subfamily.