• 654 can be written using four 4's:
654 is nontrivially palindromic in base 11.
654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
654 is an esthetic number in base 10 and base 11, because in such bases its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
654 is an admirable number.
It is an alternating number because its digits alternate between even and odd.
654 is an undulating number in base 11.
It is a straight-line number, since its digits are in arithmetic progression.
It is a plaindrome in base 12, base 14 and base 16.
It is a nialpdrome in base 10.
It is a congruent number.
It is an upside-down number.
654 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
654 is a wasteful number, since it uses less digits than its factorization.
654 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 114.
The square root of 654 is about 25.5734237051. The cubic root of 654 is about 8.6801237356.
The spelling of 654 in words is "six hundred fifty-four", and thus it is an aban number.