668826 has 24 divisors (see below), whose sum is σ = 1471860. Its totient is φ = 219456.

The previous prime is 668821. The next prime is 668851. The reversal of 668826 is 628866.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 27225 = 801^2 + 165^2 .

It is not an unprimeable number, because it can be changed into a prime (668821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1060 + ... + 1568.

2⁶⁶⁸⁸²⁶ is an apocalyptic number.

668826 is an abundant number, since it is smaller than the sum of its proper divisors (803034).

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

668826 is a wasteful number, since it uses less digits than its factorization.

668826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 587 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 668826 is about 817.8178281256. The cubic root of 668826 is about 87.4522623958.

The spelling of 668826 in words is "six hundred sixty-eight thousand, eight hundred twenty-six".