12728521769826 has 128 divisors (see below), whose sum is σ = 26962207506432. Its totient is φ = 3999640680000.

The previous prime is 12728521769801. The next prime is 12728521769851. The reversal of 12728521769826 is 62896712582721.

It is an interprime number because it is at equal distance from previous prime (12728521769801) and next prime (12728521769851).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6951676731 + ... + 6951678561.

It is an arithmetic number, because the mean of its divisors is an integer number (210642246144).

Almost surely, 2^{12728521769826} is an apocalyptic number.

12728521769826 is an abundant number, since it is smaller than the sum of its proper divisors (14233685736606).

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

12728521769826 is a wasteful number, since it uses less digits than its factorization.

12728521769826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788.

The product of its digits is 81285120, while the sum is 66.

The spelling of 12728521769826 in words is "twelve trillion, seven hundred twenty-eight billion, five hundred twenty-one million, seven hundred sixty-nine thousand, eight hundred twenty-six".