• 628 can be written using four 4's:
628 is nontrivially palindromic in base 9 and base 12.
628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
628 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.
628 is a Gilda number.
628 is an undulating number in base 9.
628 is a nontrivial repdigit in base 12.
It is a plaindrome in base 7, base 12 and base 15.
It is a nialpdrome in base 11 and base 12.
It is a zygodrome in base 12.
It is a congruent number.
It is an unprimeable number.
628 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is an amenable number.
628 is a wasteful number, since it uses less digits than its factorization.
628 is an odious number, because the sum of its binary digits is odd.
The square root of 628 is about 25.0599281723. The cubic root of 628 is about 8.5635377114.