1328556085 has 4 divisors (see below), whose sum is σ = 1594267308. Its totient is φ = 1062844864.

The previous prime is 1328556049. The next prime is 1328556143. The reversal of 1328556085 is 5806558231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5806558231 = 461 ⋅12595571.

It can be written as a sum of positive squares in 2 ways, for example, as 897661521 + 430894564 = 29961^2 + 20758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328556085 - 2⁹ = 1328555573 is a prime.

It is a super-2 number, since 2×1328556085² = 3530122541981054450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132855604 + ... + 132855613.

It is an arithmetic number, because the mean of its divisors is an integer number (398566827).

Almost surely, 2^1328556085 is an apocalyptic number.

It is an amenable number.

1328556085 is a deficient number, since it is larger than the sum of its proper divisors (265711223).

1328556085 is an equidigital number, since it uses as much as digits as its factorization.

1328556085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265711222.

The product of its (nonzero) digits is 288000, while the sum is 43.

The square root of 1328556085 is about 36449.3633003376. The cubic root of 1328556085 is about 1099.3263326927.

The spelling of 1328556085 in words is "one billion, three hundred twenty-eight million, five hundred fifty-six thousand, eighty-five".