328740691 has 4 divisors (see below), whose sum is σ = 328946112. Its totient is φ = 328535272.

The previous prime is 328740689. The next prime is 328740739. The reversal of 328740691 is 196047823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196047823 = 619 ⋅316717.

It is a cyclic number.

It is not a de Polignac number, because 328740691 - 2¹ = 328740689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328740631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100291 + ... + 103516.

It is an arithmetic number, because the mean of its divisors is an integer number (82236528).

Almost surely, 2^328740691 is an apocalyptic number.

328740691 is a deficient number, since it is larger than the sum of its proper divisors (205421).

328740691 is a wasteful number, since it uses less digits than its factorization.

328740691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205420.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 328740691 is about 18131.2076542077. The cubic root of 328740691 is about 690.1621764001.

The spelling of 328740691 in words is "three hundred twenty-eight million, seven hundred forty thousand, six hundred ninety-one".