1328357605 has 4 divisors (see below), whose sum is σ = 1594029132. Its totient is φ = 1062686080.

The previous prime is 1328357593. The next prime is 1328357627. The reversal of 1328357605 is 5067538231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255008961 + 1073348644 = 15969^2 + 32762^2 .

It is not a de Polignac number, because 1328357605 - 2²⁵ = 1294803173 is a prime.

It is a super-2 number, since 2×1328357605² = 3529067853522672050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 132835756 + ... + 132835765.

It is an arithmetic number, because the mean of its divisors is an integer number (398507283).

Almost surely, 2^1328357605 is an apocalyptic number.

It is an amenable number.

1328357605 is a deficient number, since it is larger than the sum of its proper divisors (265671527).

1328357605 is an equidigital number, since it uses as much as digits as its factorization.

1328357605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265671526.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1328357605 is about 36446.6405173371. The cubic root of 1328357605 is about 1099.2715852468.

The spelling of 1328357605 in words is "one billion, three hundred twenty-eight million, three hundred fifty-seven thousand, six hundred five".