321668 has 24 divisors (see below), whose sum is σ = 604800. Its totient is φ = 149408.

The previous prime is 321661. The next prime is 321679. The reversal of 321668 is 866123.

321668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321668.

It is not an unprimeable number, because it can be changed into a prime (321661) by changing a digit.

321668 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5423 + ... + 5481.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2³²¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

321668 is a deficient number, since it is larger than the sum of its proper divisors (283132).

321668 is a wasteful number, since it uses less digits than its factorization.

321668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 137 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 321668 is about 567.1578263588. The cubic root of 321668 is about 68.5176753010.

It can be divided in two parts, 321 and 668, that added together give a palindrome (989).

The spelling of 321668 in words is "three hundred twenty-one thousand, six hundred sixty-eight".