1328330681 has 4 divisors (see below), whose sum is σ = 1333381632. Its totient is φ = 1323279732.

The previous prime is 1328330671. The next prime is 1328330777. The reversal of 1328330681 is 1860338231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1860338231 = 673 ⋅2764247.

It is a cyclic number.

It is not a de Polignac number, because 1328330681 - 2⁶ = 1328330617 is a prime.

It is a super-2 number, since 2×1328330681² = 3528924796171847522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1328330651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525081 + ... + 2525606.

It is an arithmetic number, because the mean of its divisors is an integer number (333345408).

Almost surely, 2^1328330681 is an apocalyptic number.

It is an amenable number.

1328330681 is a deficient number, since it is larger than the sum of its proper divisors (5050951).

1328330681 is an equidigital number, since it uses as much as digits as its factorization.

1328330681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050950.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1328330681 is about 36446.2711535762. The cubic root of 1328330681 is about 1099.2641582839.

The spelling of 1328330681 in words is "one billion, three hundred twenty-eight million, three hundred thirty thousand, six hundred eighty-one".