668708 has 6 divisors (see below), whose sum is σ = 1170246. Its totient is φ = 334352.

The previous prime is 668699. The next prime is 668713. The reversal of 668708 is 807866.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 195364 = 688^2 + 442^2 .

It is a plaindrome in base 14.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 83585 + ... + 83592.

It is an arithmetic number, because the mean of its divisors is an integer number (195041).

2⁶⁶⁸⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

668708 is a deficient number, since it is larger than the sum of its proper divisors (501538).

668708 is a wasteful number, since it uses less digits than its factorization.

668708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167181 (or 167179 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 668708 is about 817.7456817373. The cubic root of 668708 is about 87.4471190681.

The spelling of 668708 in words is "six hundred sixty-eight thousand, seven hundred eight".