He said alleviation of poverty from interior Sindh will be among top priorities of his government.
The charged PTI supporters, including women and children, showed their solidarity with Khan during the rally that started at 9 pm on Sunday and lasted till 3 am on Monday.
The prime minister needs 172 votes in the lower house of 342 to foil the Opposition's bid to topple him.
Pakistan has formed a high-level panel to probe the high treason case against former military ruler Pervez Musharraf for imposing emergency rule in 2007, the government said on Thursday.
Two of his allied parties also withdrew their support and joined the ranks of the rejuvenated Opposition.
No prime minister in Pakistan's recent history has survived long in office after appointing an ISI chief who did not have the army chief's confidence. Imran may be no exception, observes Rana Banerji, who headed the Pakistan desk at the Research and Analysis Wing.
Talking to reporters in Islamabad, he said the Opposition has laid all of their cards, but the no-confidence motion against him would not be successful.
The maiden meeting between the Pakistan government and a Taliban-nominated committee to frame a roadmap for peace talks was postponed on Tuesday, with representatives of the banned group claiming state negotiators had pulled out under "pressure".
With the maulana fully committed and PML (N) cadres prepared to court arrest, this would be the first time where both Punjabis and Pakhtuns would be standing up against the Pakistan army, notes Rana Banerji, who headed the Pakistan desk at the Research and Analysis Wing, India's external intelligence agency.
Counting has begun for the election which will be the second democratic transition of power in the nation's 70-year history.
PTI spokesman Fawad Chaudhry said that they have the required numbers to form government.
It is for the first time in the history of Independent India that not a single Muslim is part of the Union Cabinet.
'Against the backdrop of difficult administrative, political and economic problems, Imran's temperament and staying power will be the subject of intense expectation and public scrutiny,' says Rana Banerji, who headed the Pakistan Desk at the Research and Analysis Wing, India's external intelligence agency.
Jamiat chief Maulana Arshad Madani said they took the decision following extensive deliberations involving lawyers and experts.
The perpetrators of the 2008 Mumbai attack, who shot dead 166 people, had confessed to details that should have been enough to hang him, but Pakistan enjoyed his anti-India rhetoric and let him spread his tentacles. A revealing excerpt from Khaled Ahmed's Pakistan's Terror Conundrum.
A lot of the terrorism that is affecting Pakistan is really a blowback of the Pakistani state's policy of using jihadist groups as instruments of state policy. And unlike some other countries with similar policies, Pakistan doesn't have the benefit of the political and social space for pulling back from the disastrous course, says Sushant Sareen.
'I want to be murdered at your hands, so I can live on in history. The verdict of who is or is not a traitor cannot be pronounced by a secret agency, but by history.' Pakistani journalist Hamid Mir, who survived an assassination attempt on April 19, challenges his enemies to dub him a traitor and says nothing will stop him from exposing them.