12445728 has 24 divisors (see below), whose sum is σ = 32670288. Its totient is φ = 4148544.

The previous prime is 12445723. The next prime is 12445753. The reversal of 12445728 is 82754421.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×12445728² = 309792290899968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12445723) 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, 64726 + ... + 64917.

It is an arithmetic number, because the mean of its divisors is an integer number (1361262).

Almost surely, 2^12445728 is an apocalyptic number.

It is an amenable number.

12445728 is an abundant number, since it is smaller than the sum of its proper divisors (20224560).

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

12445728 is a wasteful number, since it uses less digits than its factorization.

12445728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129656 (or 129648 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 12445728 is about 3527.8503369616. The cubic root of 12445728 is about 231.7430766590.

The spelling of 12445728 in words is "twelve million, four hundred forty-five thousand, seven hundred twenty-eight".