668308 has 6 divisors (see below), whose sum is σ = 1169546. Its totient is φ = 334152.

The previous prime is 668303. The next prime is 668347. The reversal of 668308 is 803866.

668308 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 374544 + 293764 = 612^2 + 542^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 668308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83535 + ... + 83542.

2⁶⁶⁸³⁰⁸ is an apocalyptic number.

It is an amenable number.

668308 is a deficient number, since it is larger than the sum of its proper divisors (501238).

668308 is a wasteful number, since it uses less digits than its factorization.

668308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167081 (or 167079 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 668308 is about 817.5010703357. The cubic root of 668308 is about 87.4296795557.

The spelling of 668308 in words is "six hundred sixty-eight thousand, three hundred eight".