Courtesty of Youtube.com

So the world’s tallest building is open in the land which nearly went bust but was rescued by a friendly, wealthy neighbour …

Burj Dubai (pictured left), whose name is now Burj Khalifa (in honour of the ruler of Abu Dhabi), has already set a new record for its height – 828 metres with more than 160 floors – but here are some more numbers associated with the new landmark.

• 95 - the distance in kilometres at which Burj Khalifa’s spire can still be seen

• 124 - the floor location of "At The Top", the world's highest and only publicly accessible observation deck with an outdoor terrace

• 160 - the number of luxury hotel rooms and suites

• 605 - the vertical height in metres to which concrete was pumped in the construction of Burj Khalifa, a world record for concrete pumping

• 504 - the distance travelled, or "rise" in metres of Burj Khalifa's main service lift, the most of any elevator

• 49 - the number of office floors, including the 12-floor annexure

• 57 - the number of elevators

• 1,044 - the total number of residential apartments inside Burj Khalifa

• 3,000 - the number of underground parking spaces

• 5,500 - the capacity in kilogrammess of the tower's service lift

• 31,400 - the amount of steel rebar in metric tonnes used in the structure of Burj Khalifa

• 28,261- the number of glass cladding panels making up the exterior of tower and its two annexes

• 15,000 - the amount of water in litres collected from the tower's cooling equipment that will be used for landscaping irrigation

900 - the length in the feet of the world's tallest performing fountain, The Dubai Fountain, that lies at the foot of the tower

• 19 - the number of hectares of lush green landscaping that envelops the foot of the tower

• 12,000 - the numbers of workers on site during peak of construction

My, how clean those windows look

And if you want to know how they cleaned the windows in time for the official launch on January 4, well, the job went to Australian company, Cox Gomyl and they did it, using squeegees, buckets and A$7.3 million of hi-tech equipment, according to a report in AFP.

General manager, Dale Harding, said the firm designed and installed the Burj Khalifa's unique window-cleaning carousels, which were in action ahead of its official opening.

Twelve machines weighing 13 tons carried up to 36 cleaners, who used ordinary soapy water to wash down the Burj's 24,830 reflective windows in a process that takes three months, top to bottom.

"It's the same as an average shop front cleaner would use - there's nothing complex about it at all," he said.

The cleaners stand on the specially designed machines, which emerge from cavities in the skyscraper and track along rails skirting its curved towers.

“It's an enormous challenge. The architects had some fairly high expectations," Harding said.