428

428 = 2 x 2 x 107.

428 has the property that its square is the concatenation of two consecutive numbers (A030467): 428² = 183184.

428 is 654 in base 8. It is 525 in base 9 (A029955).

428 is the number of ways of writing 34 as a sum of 8 nonnegative cubes (A173681).

428 is a heptadecagonal (17-gonal) number (A051869).

Source: What's Special About This Number?