668828 has 12 divisors (see below), whose sum is σ = 1176672. Its totient is φ = 332640.

The previous prime is 668821. The next prime is 668851. The reversal of 668828 is 828866.

It is a junction number, because it is equal to n+sod(n) for n = 668791 and 668800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668821) by changing a digit.

668828 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 1392.

It is an arithmetic number, because the mean of its divisors is an integer number (98056).

2⁶⁶⁸⁸²⁸ is an apocalyptic number.

It is an amenable number.

668828 is a deficient number, since it is larger than the sum of its proper divisors (507844).

668828 is a wasteful number, since it uses less digits than its factorization.

668828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 890 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 668828 is about 817.8190508908. The cubic root of 668828 is about 87.4523495656.

Adding to 668828 its sum of digits (38), we get a palindrome (668866).

The spelling of 668828 in words is "six hundred sixty-eight thousand, eight hundred twenty-eight".