670668 has 12 divisors (see below), whose sum is σ = 1564920. Its totient is φ = 223552.

The previous prime is 670639. The next prime is 670669. The reversal of 670668 is 866076.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (670669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27933 + ... + 27956.

It is an arithmetic number, because the mean of its divisors is an integer number (130410).

2⁶⁷⁰⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

670668 is an abundant number, since it is smaller than the sum of its proper divisors (894252).

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

670668 is a wasteful number, since it uses less digits than its factorization.

670668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55896 (or 55894 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 670668 is about 818.9432214751. The cubic root of 670668 is about 87.5324723014.

The spelling of 670668 in words is "six hundred seventy thousand, six hundred sixty-eight".