12275209728 has 120 divisors (see below), whose sum is σ = 35477369928. Its totient is φ = 4085932032.

The previous prime is 12275209691. The next prime is 12275209757. The reversal of 12275209728 is 82790257221.

12275209728 is a `hidden beast` number, since 12 + 2 + 7 + 520 + 97 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4316275 + ... + 4319117.

Almost surely, 2^12275209728 is an apocalyptic number.

12275209728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12275209728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17738684964).

12275209728 is an abundant number, since it is smaller than the sum of its proper divisors (23202160200).

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

12275209728 is an equidigital number, since it uses as much as digits as its factorization.

12275209728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804 (or 3785 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 12275209728 in words is "twelve billion, two hundred seventy-five million, two hundred nine thousand, seven hundred twenty-eight".