668144 has 10 divisors (see below), whose sum is σ = 1294560. Its totient is φ = 334064.

The previous prime is 668141. The next prime is 668153. The reversal of 668144 is 441866.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668144.

It is not an unprimeable number, because it can be changed into a prime (668141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20864 + ... + 20895.

It is an arithmetic number, because the mean of its divisors is an integer number (129456).

2⁶⁶⁸¹⁴⁴ is an apocalyptic number.

It is an amenable number.

668144 is a deficient number, since it is larger than the sum of its proper divisors (626416).

668144 is a wasteful number, since it uses less digits than its factorization.

668144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41767 (or 41761 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 668144 is about 817.4007585022. The cubic root of 668144 is about 87.4225273442.

The spelling of 668144 in words is "six hundred sixty-eight thousand, one hundred forty-four".