12012400880 has 80 divisors (see below), whose sum is σ = 29564045280. Its totient is φ = 4531344384.

The previous prime is 12012400879. The next prime is 12012400891. The reversal of 12012400880 is 8800421021.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 39554 + ... + 159966.

It is an arithmetic number, because the mean of its divisors is an integer number (369550566).

Almost surely, 2^12012400880 is an apocalyptic number.

12012400880 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 12012400880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14782022640).

12012400880 is an abundant number, since it is smaller than the sum of its proper divisors (17551644400).

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

12012400880 is a wasteful number, since it uses less digits than its factorization.

12012400880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120498 (or 120492 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 12012400880 in words is "twelve billion, twelve million, four hundred thousand, eight hundred eighty".