12728958635 has 4 divisors (see below), whose sum is σ = 15274750368. Its totient is φ = 10183166904.

The previous prime is 12728958611. The next prime is 12728958677. The reversal of 12728958635 is 53685982721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12728958635 - 2¹⁰ = 12728957611 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272895859 + ... + 1272895868.

It is an arithmetic number, because the mean of its divisors is an integer number (3818687592).

Almost surely, 2^12728958635 is an apocalyptic number.

12728958635 is a deficient number, since it is larger than the sum of its proper divisors (2545791733).

12728958635 is an equidigital number, since it uses as much as digits as its factorization.

12728958635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545791732.

The product of its digits is 7257600, while the sum is 56.

The spelling of 12728958635 in words is "twelve billion, seven hundred twenty-eight million, nine hundred fifty-eight thousand, six hundred thirty-five".