668604384 has 144 divisors (see below), whose sum is σ = 2226238560. Its totient is φ = 186347520.

The previous prime is 668604361. The next prime is 668604421. The reversal of 668604384 is 483406866.

668604384 is a `hidden beast` number, since 6 + 6 + 8 + 604 + 38 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78612 + ... + 86700.

It is an arithmetic number, because the mean of its divisors is an integer number (15459990).

Almost surely, 2^668604384 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 668604384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113119280).

668604384 is an abundant number, since it is smaller than the sum of its proper divisors (1557634176).

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

668604384 is a wasteful number, since it uses less digits than its factorization.

668604384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8153 (or 8142 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 668604384 is about 25857.3854826817. The cubic root of 668604384 is about 874.4260220434.

The spelling of 668604384 in words is "six hundred sixty-eight million, six hundred four thousand, three hundred eighty-four".