321808768 has 32 divisors (see below), whose sum is σ = 661792320. Its totient is φ = 155712000.

The previous prime is 321808763. The next prime is 321808777. The reversal of 321808768 is 867808123.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321808763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36583 + ... + 44518.

It is an arithmetic number, because the mean of its divisors is an integer number (20681010).

Almost surely, 2^321808768 is an apocalyptic number.

It is an amenable number.

321808768 is an abundant number, since it is smaller than the sum of its proper divisors (339983552).

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

321808768 is an equidigital number, since it uses as much as digits as its factorization.

321808768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81146 (or 81134 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 321808768 is about 17939.0291822049. The cubic root of 321808768 is about 685.2766872017.

The spelling of 321808768 in words is "three hundred twenty-one million, eight hundred eight thousand, seven hundred sixty-eight".