668905104 has 160 divisors (see below), whose sum is σ = 2057011200. Its totient is φ = 183283200.

The previous prime is 668905099. The next prime is 668905109. The reversal of 668905104 is 401509866.

It is an interprime number because it is at equal distance from previous prime (668905099) and next prime (668905109).

It is not an unprimeable number, because it can be changed into a prime (668905109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1551769 + ... + 1552199.

It is an arithmetic number, because the mean of its divisors is an integer number (12856320).

Almost surely, 2^668905104 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 668905104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028505600).

668905104 is an abundant number, since it is smaller than the sum of its proper divisors (1388106096).

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

668905104 is a wasteful number, since it uses less digits than its factorization.

668905104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 668905104 is about 25863.1998020353. The cubic root of 668905104 is about 874.5571000450.

The spelling of 668905104 in words is "six hundred sixty-eight million, nine hundred five thousand, one hundred four".