668484 has 36 divisors (see below), whose sum is σ = 1747200. Its totient is φ = 215280.

The previous prime is 668471. The next prime is 668509. The reversal of 668484 is 484866.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 817 + ... + 1415.

2⁶⁶⁸⁴⁸⁴ 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 668484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (873600).

668484 is an abundant number, since it is smaller than the sum of its proper divisors (1078716).

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

668484 is a wasteful number, since it uses less digits than its factorization.

668484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 635 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 668484 is about 817.6087083685. The cubic root of 668484 is about 87.4373537982.

The spelling of 668484 in words is "six hundred sixty-eight thousand, four hundred eighty-four".