11728381018 has 8 divisors (see below), whose sum is σ = 17790241140. Its totient is φ = 5798300640.

The previous prime is 11728381003. The next prime is 11728381019. The reversal of 11728381018 is 81018382711.

It can be written as a sum of positive squares in 2 ways, for example, as 11634426769 + 93954249 = 107863^2 + 9693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (11728381019) 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, 32944713 + ... + 32945068.

Almost surely, 2^11728381018 is an apocalyptic number.

11728381018 is a deficient number, since it is larger than the sum of its proper divisors (6061860122).

11728381018 is an equidigital number, since it uses as much as digits as its factorization.

11728381018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65889872.

The product of its (nonzero) digits is 21504, while the sum is 40.

The spelling of 11728381018 in words is "eleven billion, seven hundred twenty-eight million, three hundred eighty-one thousand, eighteen".