1296239506728 has 32 divisors (see below), whose sum is σ = 3241790764800. Its totient is φ = 431920902528.

The previous prime is 1296239506721. The next prime is 1296239506739. The reversal of 1296239506728 is 8276059326921.

It is not an unprimeable number, because it can be changed into a prime (1296239506721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9866701 + ... + 9997212.

It is an arithmetic number, because the mean of its divisors is an integer number (101305961400).

Almost surely, 2^{1296239506728} is an apocalyptic number.

It is an amenable number.

1296239506728 is an abundant number, since it is smaller than the sum of its proper divisors (1945551258072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1296239506728 is a wasteful number, since it uses less digits than its factorization.

1296239506728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19866641 (or 19866637 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 1296239506728 in words is "one trillion, two hundred ninety-six billion, two hundred thirty-nine million, five hundred six thousand, seven hundred twenty-eight".