668692 has 6 divisors (see below), whose sum is σ = 1170218. Its totient is φ = 334344.

The previous prime is 668687. The next prime is 668699. The reversal of 668692 is 296866.

It can be written as a sum of positive squares in only one way, i.e., 404496 + 264196 = 636^2 + 514^2 .

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668699) by changing a digit.

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, 83583 + ... + 83590.

2⁶⁶⁸⁶⁹² is an apocalyptic number.

It is an amenable number.

668692 is a deficient number, since it is larger than the sum of its proper divisors (501526).

668692 is a wasteful number, since it uses less digits than its factorization.

668692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167177 (or 167175 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 668692 is about 817.7358986861. The cubic root of 668692 is about 87.4464216211.

The spelling of 668692 in words is "six hundred sixty-eight thousand, six hundred ninety-two".