320206656 has 224 divisors, whose sum is σ = 1070945280. Its totient is φ = 82705920.

The previous prime is 320206651. The next prime is 320206669. The reversal of 320206656 is 656602023.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320206651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1788775 + ... + 1788953.

Almost surely, 2^320206656 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 320206656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535472640).

320206656 is an abundant number, since it is smaller than the sum of its proper divisors (750738624).

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

320206656 is a wasteful number, since it uses less digits than its factorization.

320206656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 320206656 is about 17894.3190985296. The cubic root of 320206656 is about 684.1375873150.

Adding to 320206656 its reverse (656602023), we get a palindrome (976808679).

The spelling of 320206656 in words is "three hundred twenty million, two hundred six thousand, six hundred fifty-six".