320580666 has 112 divisors (see below), whose sum is σ = 834807168. Its totient is φ = 90396000.

The previous prime is 320580629. The next prime is 320580677. The reversal of 320580666 is 666085023.

It is a self number, because there is not a number n which added to its sum of digits gives 320580666.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1030651 + ... + 1030961.

Almost surely, 2^320580666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320580666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (417403584).

320580666 is an abundant number, since it is smaller than the sum of its proper divisors (514226502).

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

320580666 is a wasteful number, since it uses less digits than its factorization.

320580666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 320580666 is about 17904.7665720612. The cubic root of 320580666 is about 684.4038473860.

The spelling of 320580666 in words is "three hundred twenty million, five hundred eighty thousand, six hundred sixty-six".