3642

3642 = 2 x 3 x 607.

3642 is 320322 in base 4 and 7072 in base 8.

3642 is the number of labeled topologies with 5 points.

3642 and 3642² use only the digits 1, 2, 3, 4, and 6. The internal digits of the squared number include only the digits of the number.

36423641 and 36423643 are a pair of twin primes.

3642 is one of the 36 Class steam locomotives operated by the New South Wales Government Railways.

Source: On-Line Encyclopedia of Integer Sequences