How many overseas Chinese are there in China?

How many overseas Chinese are there? Due to the lack of authoritative statistical data, it is generally recognized that there are more than 35 million people, including overseas Chinese and foreign Chinese. Professor Zeng Shaocong from the Overseas Chinese Research Center of China Academy of Social Sciences said that before liberation, overseas Chinese mainly came from three major regions. Among them, the Chinese in Southeast Asia mainly come from Fujian, including Minnan people and Hakkas; After the discovery of gold mines in the United States, mainly Guangfu people went, mainly from Guangzhou and its nearby areas; Chinese in Europe are mainly Zhejiang immigrants during the Republic of China. Now overseas Chinese have spread all over the world, but 80% of them are in Southeast Asia.