11728337778 has 12 divisors (see below), whose sum is σ = 25411398558. Its totient is φ = 3909445920.

The previous prime is 11728337741. The next prime is 11728337801. The reversal of 11728337778 is 87773382711.

11728337778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10981572849 + 746764929 = 104793^2 + 27327^2 .

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 5 ways as a sum of consecutive naturals, for example, 325787143 + ... + 325787178.

Almost surely, 2^11728337778 is an apocalyptic number.

11728337778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11728337778 is an abundant number, since it is smaller than the sum of its proper divisors (13683060780).

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

11728337778 is a wasteful number, since it uses less digits than its factorization.

11728337778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651574329 (or 651574326 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 54.

The spelling of 11728337778 in words is "eleven billion, seven hundred twenty-eight million, three hundred thirty-seven thousand, seven hundred seventy-eight".