12128613920 has 96 divisors (see below), whose sum is σ = 29977879680. Its totient is φ = 4628377600.

The previous prime is 12128613911. The next prime is 12128613947. The reversal of 12128613920 is 2931682121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1471571 + ... + 1479789.

It is an arithmetic number, because the mean of its divisors is an integer number (312269580).

Almost surely, 2^12128613920 is an apocalyptic number.

12128613920 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 12128613920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14988939840).

12128613920 is an abundant number, since it is smaller than the sum of its proper divisors (17849265760).

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

12128613920 is a wasteful number, since it uses less digits than its factorization.

12128613920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658 (or 8650 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 12128613920 in words is "twelve billion, one hundred twenty-eight million, six hundred thirteen thousand, nine hundred twenty".