1328731705 has 16 divisors (see below), whose sum is σ = 1841051520. Its totient is φ = 901734912.

The previous prime is 1328731681. The next prime is 1328731709. The reversal of 1328731705 is 5071378231.

It is a cyclic number.

It is not a de Polignac number, because 1328731705 - 2²⁹ = 791860793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1328731709) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 192295 + ... + 199084.

It is an arithmetic number, because the mean of its divisors is an integer number (115065720).

Almost surely, 2^1328731705 is an apocalyptic number.

It is an amenable number.

1328731705 is a deficient number, since it is larger than the sum of its proper divisors (512319815).

1328731705 is an equidigital number, since it uses as much as digits as its factorization.

1328731705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391488.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 1328731705 is about 36451.7723163086. The cubic root of 1328731705 is about 1099.3747700367.

The spelling of 1328731705 in words is "one billion, three hundred twenty-eight million, seven hundred thirty-one thousand, seven hundred five".