12011728 has 20 divisors (see below), whose sum is σ = 23506308. Its totient is φ = 5945600.

The previous prime is 12011723. The next prime is 12011731. The reversal of 12011728 is 82711021.

It can be written as a sum of positive squares in 2 ways, for example, as 6290064 + 5721664 = 2508^2 + 2392^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12011699 and 12011708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101 + ... + 5332.

Almost surely, 2^12011728 is an apocalyptic number.

It is an amenable number.

12011728 is a deficient number, since it is larger than the sum of its proper divisors (11494580).

12011728 is a wasteful number, since it uses less digits than its factorization.

12011728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7542 (or 7536 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 12011728 is about 3465.7939927237. The cubic root of 12011728 is about 229.0174087183.

Adding to 12011728 its reverse (82711021), we get a palindrome (94722749).

The spelling of 12011728 in words is "twelve million, eleven thousand, seven hundred twenty-eight".