668670 has 32 divisors (see below), whose sum is σ = 1658880. Its totient is φ = 172320.

The previous prime is 668623. The next prime is 668671. The reversal of 668670 is 76866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶⁶⁸⁶⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829440).

668670 is an abundant number, since it is smaller than the sum of its proper divisors (990210).

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

668670 is a wasteful number, since it uses less digits than its factorization.

668670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

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

The square root of 668670 is about 817.7224467996. The cubic root of 668670 is about 87.4454626134.

The spelling of 668670 in words is "six hundred sixty-eight thousand, six hundred seventy".