Catalyzes the formation of acetyl phosphate from acetate and ATP. Can also catalyze the reverse reaction. Phosphorylates propionate (54%) in addition to acetate (100%). Uses GTP (100%), ITP (163%), UTP (56%), and CTP (21%) as phosphoryl donors in addition to ATP (100%). acetate + ATP = acetyl phosphate + ADP Mg(2+). Can also accept Mn(2+). Optimum pH is 7.0. Optimum temperature is 90 degrees Celsius. Metabolic intermediate biosynthesis; acetyl-CoA biosynthesis; acetyl-CoA from acetate: step 1/2. Homodimer. Belongs to the acetokinase family.