12800000000 has 144 divisors (see below), whose sum is σ = 31999495335. Its totient is φ = 5120000000.

The previous prime is 12799999981. The next prime is 12800000021. The reversal of 12800000000 is 821.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 12202295296 + 597704704 = 110464^2 + 24448^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=80000.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2559999998 + ... + 2560000002.

Almost surely, 2^12800000000 is an apocalyptic number.

12800000000 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 12800000000

12800000000 is an abundant number, since it is smaller than the sum of its proper divisors (19199495335).

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

12800000000 is an frugal number, since it uses more digits than its factorization.

12800000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12800000000 its reverse (821), we get a palindrome (12800000821).

The spelling of 12800000000 in words is "twelve billion, eight hundred million", and thus it is an aban number.