11028779868887 has 4 divisors (see below), whose sum is σ = 12031396220616. Its totient is φ = 10026163517160.

The previous prime is 11028779868797. The next prime is 11028779868889. The reversal of 11028779868887 is 78886897782011.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11028779868887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11028779868889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501308175848 + ... + 501308175869.

It is an arithmetic number, because the mean of its divisors is an integer number (3007849055154).

Almost surely, 2^{11028779868887} is an apocalyptic number.

11028779868887 is a deficient number, since it is larger than the sum of its proper divisors (1002616351729).

11028779868887 is a wasteful number, since it uses less digits than its factorization.

11028779868887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002616351728.

The product of its (nonzero) digits is 1213857792, while the sum is 80.

The spelling of 11028779868887 in words is "eleven trillion, twenty-eight billion, seven hundred seventy-nine million, eight hundred sixty-eight thousand, eight hundred eighty-seven".