668622 has 16 divisors (see below), whose sum is σ = 1366272. Its totient is φ = 218040.

The previous prime is 668617. The next prime is 668623. The reversal of 668622 is 226866.

It is a self number, because there is not a number n which added to its sum of digits gives 668622.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668622.

It is not an unprimeable number, because it can be changed into a prime (668623) by changing a digit.

668622 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 in 7 ways as a sum of consecutive naturals, for example, 904 + ... + 1467.

It is an arithmetic number, because the mean of its divisors is an integer number (85392).

2⁶⁶⁸⁶²² is an apocalyptic number.

668622 is an abundant number, since it is smaller than the sum of its proper divisors (697650).

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

668622 is a wasteful number, since it uses less digits than its factorization.

668622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423.

The product of its digits is 6912, while the sum is 30.

The square root of 668622 is about 817.6930964610. The cubic root of 668622 is about 87.4433701599.

The spelling of 668622 in words is "six hundred sixty-eight thousand, six hundred twenty-two".