Exocrine glands are present in the outer surface of our body. These are
Aprocrine glands, Holocrine glands and Merocrine glands. They are also known as Sweat glands, Salivery glands and mammary glands. Liver is also an Exocrine gland.
If you are asking for the total number of them all over the surface of a human (adult) body, then it will be very large. perhaps 500,000 or even more.