12105728 has 48 divisors (see below), whose sum is σ = 25356240. Its totient is φ = 5767168.

The previous prime is 12105647. The next prime is 12105733. The reversal of 12105728 is 82750121.

It is a junction number, because it is equal to n+sod(n) for n = 12105697 and 12105706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46976 + ... + 47232.

It is an arithmetic number, because the mean of its divisors is an integer number (528255).

Almost surely, 2^12105728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12105728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12678120).

12105728 is an abundant number, since it is smaller than the sum of its proper divisors (13250512).

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

12105728 is an equidigital number, since it uses as much as digits as its factorization.

12105728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12105728 is about 3479.3286708789. The cubic root of 12105728 is about 229.6132631236.

Adding to 12105728 its reverse (82750121), we get a palindrome (94855849).

The spelling of 12105728 in words is "twelve million, one hundred five thousand, seven hundred twenty-eight".