668380806 has 96 divisors (see below), whose sum is σ = 1603087200. Its totient is φ = 200309760.

The previous prime is 668380787. The next prime is 668380837. The reversal of 668380806 is 608083866.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 966921 + ... + 967611.

It is an arithmetic number, because the mean of its divisors is an integer number (16698825).

Almost surely, 2^668380806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668380806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801543600).

668380806 is an abundant number, since it is smaller than the sum of its proper divisors (934706394).

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

668380806 is a wasteful number, since it uses less digits than its factorization.

668380806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 668380806 is about 25853.0618302746. The cubic root of 668380806 is about 874.3285432645.

The spelling of 668380806 in words is "six hundred sixty-eight million, three hundred eighty thousand, eight hundred six".