668238 has 8 divisors (see below), whose sum is σ = 1336488. Its totient is φ = 222744.

The previous prime is 668221. The next prime is 668243. The reversal of 668238 is 832866.

It is a sphenic number, since it is the product of 3 distinct primes.

668238 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 668199 and 668208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55681 + ... + 55692.

It is an arithmetic number, because the mean of its divisors is an integer number (167061).

2⁶⁶⁸²³⁸ is an apocalyptic number.

668238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

668238 is a wasteful number, since it uses less digits than its factorization.

668238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111378.

The product of its digits is 13824, while the sum is 33.

The square root of 668238 is about 817.4582558149. The cubic root of 668238 is about 87.4266269256.

The spelling of 668238 in words is "six hundred sixty-eight thousand, two hundred thirty-eight".