11728391445 has 24 divisors (see below), whose sum is σ = 20519212896. Its totient is φ = 6196680288.

The previous prime is 11728391413. The next prime is 11728391447. The reversal of 11728391445 is 54419382711.

11728391445 is a `hidden beast` number, since 1 + 172 + 8 + 39 + 1 + 445 = 666.

It is not a de Polignac number, because 11728391445 - 2⁵ = 11728391413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11728391445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11728391447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1213087 + ... + 1222716.

It is an arithmetic number, because the mean of its divisors is an integer number (854967204).

Almost surely, 2^11728391445 is an apocalyptic number.

11728391445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11728391445 is a deficient number, since it is larger than the sum of its proper divisors (8790821451).

11728391445 is a wasteful number, since it uses less digits than its factorization.

11728391445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435921 (or 2435918 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 11728391445 in words is "eleven billion, seven hundred twenty-eight million, three hundred ninety-one thousand, four hundred forty-five".