210668 has 6 divisors (see below), whose sum is σ = 368676. Its totient is φ = 105332.

The previous prime is 210659. The next prime is 210671. The reversal of 210668 is 866012.

It is an unprimeable number.

210668 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26330 + ... + 26337.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2²¹⁰⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

210668 is a deficient number, since it is larger than the sum of its proper divisors (158008).

210668 is a wasteful number, since it uses less digits than its factorization.

210668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52671 (or 52669 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 210668 is about 458.9858385615. The cubic root of 210668 is about 59.5021772619.

It can be divided in two parts, 210 and 668, that added together give a palindrome (878).

The spelling of 210668 in words is "two hundred ten thousand, six hundred sixty-eight".