1328001265 has 8 divisors (see below), whose sum is σ = 1597700520. Its totient is φ = 1059668352.

The previous prime is 1328001251. The next prime is 1328001313. The reversal of 1328001265 is 5621008231.

It can be written as a sum of positive squares in 4 ways, for example, as 83887281 + 1244113984 = 9159^2 + 35272^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1328001265 - 2¹⁵ = 1327968497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339444 + ... + 343333.

It is an arithmetic number, because the mean of its divisors is an integer number (199712565).

Almost surely, 2^1328001265 is an apocalyptic number.

It is an amenable number.

1328001265 is a deficient number, since it is larger than the sum of its proper divisors (269699255).

1328001265 is an equidigital number, since it uses as much as digits as its factorization.

1328001265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683171.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1328001265 is about 36441.7516730467. The cubic root of 1328001265 is about 1099.1732810284.

Adding to 1328001265 its reverse (5621008231), we get a palindrome (6949009496).

The spelling of 1328001265 in words is "one billion, three hundred twenty-eight million, one thousand, two hundred sixty-five".