328063721 has 2 divisors, whose sum is σ = 328063722. Its totient is φ = 328063720.

The previous prime is 328063711. The next prime is 328063741. The reversal of 328063721 is 127360823.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 326308096 + 1755625 = 18064^2 + 1325^2 .

It is an emirp because it is prime and its reverse (127360823) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328063721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (328063711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164031860 + 164031861.

It is an arithmetic number, because the mean of its divisors is an integer number (164031861).

Almost surely, 2^328063721 is an apocalyptic number.

It is an amenable number.

328063721 is a deficient number, since it is larger than the sum of its proper divisors (1).

328063721 is an equidigital number, since it uses as much as digits as its factorization.

328063721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 328063721 is about 18112.5293926608. The cubic root of 328063721 is about 689.6881045041.

The spelling of 328063721 in words is "three hundred twenty-eight million, sixty-three thousand, seven hundred twenty-one".