668276 has 24 divisors (see below), whose sum is σ = 1384320. Its totient is φ = 276192.

The previous prime is 668273. The next prime is 668303. The reversal of 668276 is 672866.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (57680).

2⁶⁶⁸²⁷⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692160).

668276 is an abundant number, since it is smaller than the sum of its proper divisors (716044).

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

668276 is a wasteful number, since it uses less digits than its factorization.

668276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 861 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 668276 is about 817.4814982616. The cubic root of 668276 is about 87.4282840941.

The spelling of 668276 in words is "six hundred sixty-eight thousand, two hundred seventy-six".