1328727538 has 8 divisors (see below), whose sum is σ = 2004612588. Its totient is φ = 660523344.

The previous prime is 1328727527. The next prime is 1328727571. The reversal of 1328727538 is 8357278231.

It can be written as a sum of positive squares in 2 ways, for example, as 928847529 + 399880009 = 30477^2 + 19997^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 1919781 + ... + 1920472.

Almost surely, 2^1328727538 is an apocalyptic number.

1328727538 is a deficient number, since it is larger than the sum of its proper divisors (675885050).

1328727538 is a wasteful number, since it uses less digits than its factorization.

1328727538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840428.

The product of its digits is 564480, while the sum is 46.

The square root of 1328727538 is about 36451.7151585491. The cubic root of 1328727538 is about 1099.3736207955.

It can be divided in two parts, 1328727 and 538, that added together give a triangular number (1329265 = T₁₆₃₀).

The spelling of 1328727538 in words is "one billion, three hundred twenty-eight million, seven hundred twenty-seven thousand, five hundred thirty-eight".