321984560 has 20 divisors (see below), whose sum is σ = 748614288. Its totient is φ = 128793792.

The previous prime is 321984541. The next prime is 321984601. The reversal of 321984560 is 65489123.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012324 + ... + 2012483.

Almost surely, 2^321984560 is an apocalyptic number.

It is an amenable number.

321984560 is an abundant number, since it is smaller than the sum of its proper divisors (426629728).

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

321984560 is a wasteful number, since it uses less digits than its factorization.

321984560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024820 (or 4024814 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 321984560 is about 17943.9282209888. The cubic root of 321984560 is about 685.4014447623.

The spelling of 321984560 in words is "three hundred twenty-one million, nine hundred eighty-four thousand, five hundred sixty".