668824 has 32 divisors (see below), whose sum is σ = 1386000. Its totient is φ = 300672.

The previous prime is 668821. The next prime is 668851. The reversal of 668824 is 428866.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 668824.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6082 + ... + 6190.

2⁶⁶⁸⁸²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693000).

668824 is an abundant number, since it is smaller than the sum of its proper divisors (717176).

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

668824 is a wasteful number, since it uses less digits than its factorization.

668824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 183 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 668824 is about 817.8166053584. The cubic root of 668824 is about 87.4521752258.

The spelling of 668824 in words is "six hundred sixty-eight thousand, eight hundred twenty-four".