328408681 has 2 divisors, whose sum is σ = 328408682. Its totient is φ = 328408680.

The previous prime is 328408649. The next prime is 328408687. The reversal of 328408681 is 186804823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320983056 + 7425625 = 17916^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 328408681 - 2⁵ = 328408649 is a prime.

It is a super-2 number, since 2×328408681² = 215704523512319522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (328408687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164204340 + 164204341.

It is an arithmetic number, because the mean of its divisors is an integer number (164204341).

Almost surely, 2^328408681 is an apocalyptic number.

It is an amenable number.

328408681 is a deficient number, since it is larger than the sum of its proper divisors (1).

328408681 is an equidigital number, since it uses as much as digits as its factorization.

328408681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 328408681 is about 18122.0495805524. The cubic root of 328408681 is about 689.9297562043.

The spelling of 328408681 in words is "three hundred twenty-eight million, four hundred eight thousand, six hundred eighty-one".