11728805 has 16 divisors (see below), whose sum is σ = 15505344. Its totient is φ = 8446080.

The previous prime is 11728799. The next prime is 11728807. The reversal of 11728805 is 50882711.

It is a happy number.

It is not a de Polignac number, because 11728805 - 2¹² = 11724709 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 (11728807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4889 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (969084).

Almost surely, 2^11728805 is an apocalyptic number.

It is an amenable number.

11728805 is a deficient number, since it is larger than the sum of its proper divisors (3776539).

11728805 is a wasteful number, since it uses less digits than its factorization.

11728805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 11728805 is about 3424.7342962630. The cubic root of 11728805 is about 227.2050196128.

The spelling of 11728805 in words is "eleven million, seven hundred twenty-eight thousand, eight hundred five".