668226 has 24 divisors (see below), whose sum is σ = 1449360. Its totient is φ = 205296.

The previous prime is 668221. The next prime is 668243. The reversal of 668226 is 622866.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 668193 and 668202.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668226.

It is not an unprimeable number, because it can be changed into a prime (668221) by changing a digit.

668226 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (60390).

2⁶⁶⁸²²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724680).

668226 is an abundant number, since it is smaller than the sum of its proper divisors (781134).

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

668226 is a wasteful number, since it uses less digits than its factorization.

668226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 677 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 668226 is about 817.4509159576. The cubic root of 668226 is about 87.4261035962.

The spelling of 668226 in words is "six hundred sixty-eight thousand, two hundred twenty-six".