328128791 has 4 divisors (see below), whose sum is σ = 332282400. Its totient is φ = 323975184.

The previous prime is 328128767. The next prime is 328128793. The reversal of 328128791 is 197821823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197821823 = 7411 ⋅26693.

It is a cyclic number.

It is not a de Polignac number, because 328128791 - 2²² = 323934487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328128793) 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, 2076686 + ... + 2076843.

It is an arithmetic number, because the mean of its divisors is an integer number (83070600).

Almost surely, 2^328128791 is an apocalyptic number.

328128791 is a deficient number, since it is larger than the sum of its proper divisors (4153609).

328128791 is an equidigital number, since it uses as much as digits as its factorization.

328128791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153608.

The product of its digits is 48384, while the sum is 41.

The square root of 328128791 is about 18114.3255739760. The cubic root of 328128791 is about 689.7337003597.

The spelling of 328128791 in words is "three hundred twenty-eight million, one hundred twenty-eight thousand, seven hundred ninety-one".