A jubilant el-Sisi invited young Egyptian organisers to join him at the podium before he addressed a packed auditorium at the Sinai resort of Sharm el-Sheikh. Several seized the opportunity to take selfies with the Egyptian leader and joined him in what has become his customary slogan of "Long live Egypt!"
But the president swiftly stopped a chant of "long live el-Sisi."
He singled out Germany's Siemens and the United States' General Electric for special praise.
Addressing the delegates seated in the massive conference hall, the general-turned-politician said: "You have no idea how much joy you have given the people of Egypt."
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El-Sisi has staked his legitimacy on fixing the economy and restoring security, and the three-day conference has been seeking a sign of international confidence in the country's political stability.
"Some people thought my country has died, but Egypt is a country that God created so it can forever live," El-Sisi said. "Egypt was there 7,000 years ago and taught the entire world."
"This nation is awakening now," he declared.
As military chief, el-Sisi led the July 2013 military ouster of the elected but divisive Islamist President Mohammed Morsi.
Nearly a year later, el-Sisi himself was elected. El-Sisi said Egypt needed as much as USD 300 billion in investments to rebuild and give the country's 90 million people a genuine hope to live well.