668838 has 16 divisors (see below), whose sum is σ = 1408320. Its totient is φ = 211176.

The previous prime is 668821. The next prime is 668851. The reversal of 668838 is 838866.

It is a junction number, because it is equal to n+sod(n) for n = 668796 and 668805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2820 + ... + 3047.

It is an arithmetic number, because the mean of its divisors is an integer number (88020).

2⁶⁶⁸⁸³⁸ is an apocalyptic number.

668838 is an abundant number, since it is smaller than the sum of its proper divisors (739482).

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

668838 is a wasteful number, since it uses less digits than its factorization.

668838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891.

The product of its digits is 55296, while the sum is 39.

The square root of 668838 is about 817.8251646899. The cubic root of 668838 is about 87.4527854122.

The spelling of 668838 in words is "six hundred sixty-eight thousand, eight hundred thirty-eight".