320632664 has 32 divisors (see below), whose sum is σ = 659661840. Its totient is φ = 144892800.

The previous prime is 320632651. The next prime is 320632693. The reversal of 320632664 is 466236023.

It is a self number, because there is not a number n which added to its sum of digits gives 320632664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4694 + ... + 25754.

Almost surely, 2^320632664 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 320632664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329830920).

320632664 is an abundant number, since it is smaller than the sum of its proper divisors (339029176).

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

320632664 is a wasteful number, since it uses less digits than its factorization.

320632664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21251 (or 21247 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 320632664 is about 17906.2185846147. The cubic root of 320632664 is about 684.4408486893.

Adding to 320632664 its reverse (466236023), we get a palindrome (786868687).

The spelling of 320632664 in words is "three hundred twenty million, six hundred thirty-two thousand, six hundred sixty-four".