12012728 has 64 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 4580352.

The previous prime is 12012677. The next prime is 12012743. The reversal of 12012728 is 82721021.

12012728 = 1307² + 1308² + ... + 1313².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20828 + ... + 21396.

It is an arithmetic number, because the mean of its divisors is an integer number (448875).

Almost surely, 2^12012728 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 12012728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14364000).

12012728 is an abundant number, since it is smaller than the sum of its proper divisors (16715272).

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

12012728 is a wasteful number, since it uses less digits than its factorization.

12012728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12012728 is about 3465.9382568072. The cubic root of 12012728 is about 229.0237639253.

Adding to 12012728 its reverse (82721021), we get a palindrome (94733749).

It can be divided in two parts, 120127 and 28, that multiplied together give a square (3363556 = 1834²).

The spelling of 12012728 in words is "twelve million, twelve thousand, seven hundred twenty-eight".