667568 has 20 divisors (see below), whose sum is σ = 1411368. Its totient is φ = 303360.

The previous prime is 667561. The next prime is 667577. The reversal of 667568 is 865766.

667568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667561) by changing a digit.

667568 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1721 + ... + 2072.

2⁶⁶⁷⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

667568 is an abundant number, since it is smaller than the sum of its proper divisors (743800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667568 is a wasteful number, since it uses less digits than its factorization.

667568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812 (or 3806 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 667568 is about 817.0483461828. The cubic root of 667568 is about 87.3973981041.

The spelling of 667568 in words is "six hundred sixty-seven thousand, five hundred sixty-eight".