668706 has 16 divisors (see below), whose sum is σ = 1360800. Its totient is φ = 219008.

The previous prime is 668699. The next prime is 668713. The reversal of 668706 is 607866.

It is an interprime number because it is at equal distance from previous prime (668699) and next prime (668713).

It is a plaindrome in base 14.

It is an unprimeable number.

668706 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 7 ways as a sum of consecutive naturals, for example, 591 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (85050).

2⁶⁶⁸⁷⁰⁶ is an apocalyptic number.

668706 is an abundant number, since it is smaller than the sum of its proper divisors (692094).

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

668706 is a wasteful number, since it uses less digits than its factorization.

668706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953.

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

The square root of 668706 is about 817.7444588623. The cubic root of 668706 is about 87.4470318878.

The spelling of 668706 in words is "six hundred sixty-eight thousand, seven hundred six".