668445 has 8 divisors (see below), whose sum is σ = 1069536. Its totient is φ = 356496.

The previous prime is 668417. The next prime is 668471. The reversal of 668445 is 544866.

It is a happy number.

668445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668445 - 2¹⁰ = 667421 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22267 + ... + 22296.

It is an arithmetic number, because the mean of its divisors is an integer number (133692).

2⁶⁶⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

668445 is a deficient number, since it is larger than the sum of its proper divisors (401091).

668445 is a wasteful number, since it uses less digits than its factorization.

668445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44571.

The product of its digits is 23040, while the sum is 33.

The square root of 668445 is about 817.5848579811. The cubic root of 668445 is about 87.4356533720.

The spelling of 668445 in words is "six hundred sixty-eight thousand, four hundred forty-five".