668814 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 204672.

The previous prime is 668813. The next prime is 668821. The reversal of 668814 is 418866.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668814.

It is not an unprimeable number, because it can be changed into a prime (668813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8017 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶⁶⁸⁸¹⁴ is an apocalyptic number.

668814 is an abundant number, since it is smaller than the sum of its proper divisors (782706).

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

668814 is a wasteful number, since it uses less digits than its factorization.

668814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184.

The product of its digits is 9216, while the sum is 33.

The square root of 668814 is about 817.8104914954. The cubic root of 668814 is about 87.4517393731.

Adding to 668814 its product of digits (9216), we get a triangular number (678030 = T₁₁₆₄).

The spelling of 668814 in words is "six hundred sixty-eight thousand, eight hundred fourteen".