Your body has about 3 million sweat glands. Most are eccrine glands, which produce a salty fluid that evaporates to keep you cool when you're working hard.
Your feet house the most sweat glands, and thus, are usually the smelliest human body part. (Hint: To reduce foot sweat and odor, apply antiperspirant to them. Experiment at home first, though, in case of irritation.)