1328908865 has 4 divisors (see below), whose sum is σ = 1594690644. Its totient is φ = 1063127088.

The previous prime is 1328908859. The next prime is 1328908873. The reversal of 1328908865 is 5688098231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5688098231 = 66739 ⋅85229.

It can be written as a sum of positive squares in 2 ways, for example, as 1052418481 + 276490384 = 32441^2 + 16628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328908865 - 2¹⁸ = 1328646721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132890882 + ... + 132890891.

It is an arithmetic number, because the mean of its divisors is an integer number (398672661).

Almost surely, 2^1328908865 is an apocalyptic number.

It is an amenable number.

1328908865 is a deficient number, since it is larger than the sum of its proper divisors (265781779).

1328908865 is an equidigital number, since it uses as much as digits as its factorization.

1328908865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265781778.

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 1328908865 is about 36454.2022954830. The cubic root of 1328908865 is about 1099.4236278003.

The spelling of 1328908865 in words is "one billion, three hundred twenty-eight million, nine hundred eight thousand, eight hundred sixty-five".