328735691 has 2 divisors, whose sum is σ = 328735692. Its totient is φ = 328735690.

The previous prime is 328735643. The next prime is 328735697. The reversal of 328735691 is 196537823.

It is a strong prime.

It is an emirp because it is prime and its reverse (196537823) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328735691 is a prime.

It is not a weakly prime, because it can be changed into another prime (328735697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164367845 + 164367846.

It is an arithmetic number, because the mean of its divisors is an integer number (164367846).

Almost surely, 2^328735691 is an apocalyptic number.

328735691 is a deficient number, since it is larger than the sum of its proper divisors (1).

328735691 is an equidigital number, since it uses as much as digits as its factorization.

328735691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 328735691 is about 18131.0697698729. The cubic root of 328735691 is about 690.1586773622.

The spelling of 328735691 in words is "three hundred twenty-eight million, seven hundred thirty-five thousand, six hundred ninety-one".