1280000000000 has 198 divisors, whose sum is σ = 3199987727433. Its totient is φ = 512000000000.

The previous prime is 1279999999987. The next prime is 1280000000003. The reversal of 1280000000000 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 6 ways, for example, as 736795623424 + 543204376576 = 858368^2 + 737024^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=800000.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280000000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 10 ways as a sum of consecutive naturals, for example, 255999999998 + ... + 256000000002.

Almost surely, 2^{1280000000000} is an apocalyptic number.

1280000000000 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 1280000000000

1280000000000 is an abundant number, since it is smaller than the sum of its proper divisors (1919987727433).

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

1280000000000 is an frugal number, since it uses more digits than its factorization.

1280000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 7 counting only the distinct ones).

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

Adding to 1280000000000 its reverse (821), we get a palindrome (1280000000821).

The spelling of 1280000000000 in words is "one trillion, two hundred eighty billion", and thus it is an aban number.