847 was the number of Tu-4 that was build between 1949 and 1952 , not the number that the Soviets had in 1952 .
The range of the Tu-4 was 5400 km and the standard Tu-4 could not carry nuclear weapons ,that was reserved to the Tu-4A.
A range of 5400 km means 2500 km going and 2500 km returning ( there was always a margin needed ) ;shortest distance Moscow NYC = 7500 km !
Thus the Tu4 was not a longrange bomber but could only be used over Europe .
The 100000 dollar question : if the Soviets had a strategic bomber that could nuke the US ,why did they not start a conventional war in Europe ? NATO would lose in a conventional war and US could not use their nuclear weapons .