Urdu is a standardised register of the Hindustani language. It is the national language and lingua franca of Pakistan, and an official language of six states of India. It is also one of the 22 official languages recognized in the Constitution of India. There are between 60 and 70 million native speakers of Urdu: there were 52 million in India per the 2001 census, some 6% of the population; approximately 10 million in Pakistan or 7.57% per the 1998 census; and several hundred thousand in the United Kingdom, Saudi Arabia, United States, and Bangladesh (where it is called "Bihari").