12128503860 has 144 divisors (see below), whose sum is σ = 41429187072. Its totient is φ = 2845382400.

The previous prime is 12128503843. The next prime is 12128503861. The reversal of 12128503860 is 6830582121.

It is a happy number.

12128503860 is a `hidden beast` number, since 121 + 28 + 503 + 8 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128503861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37419 + ... + 160178.

It is an arithmetic number, because the mean of its divisors is an integer number (287702688).

Almost surely, 2^12128503860 is an apocalyptic number.

12128503860 is a gapful number since it is divisible by the number (10) 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 12128503860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20714593536).

12128503860 is an abundant number, since it is smaller than the sum of its proper divisors (29300683212).

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

12128503860 is a wasteful number, since it uses less digits than its factorization.

12128503860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197654 (or 197649 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 12128503860 in words is "twelve billion, one hundred twenty-eight million, five hundred three thousand, eight hundred sixty".