321656064 has 72 divisors (see below), whose sum is σ = 858823392. Its totient is φ = 106874880.

The previous prime is 321656063. The next prime is 321656089. The reversal of 321656064 is 460656123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321656063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376662 + ... + 377514.

Almost surely, 2^321656064 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 321656064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429411696).

321656064 is an abundant number, since it is smaller than the sum of its proper divisors (537167328).

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

321656064 is an equidigital number, since it uses as much as digits as its factorization.

321656064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 321656064 is about 17934.7724825268. The cubic root of 321656064 is about 685.1682780491.

The spelling of 321656064 in words is "three hundred twenty-one million, six hundred fifty-six thousand, sixty-four".