1280243694880 has 96 divisors (see below), whose sum is σ = 3207400673904. Its totient is φ = 481235337216.

The previous prime is 1280243694859. The next prime is 1280243694907. The reversal of 1280243694880 is 884963420821.

It can be written as a sum of positive squares in 8 ways, for example, as 767719430416 + 512524264464 = 876196^2 + 715908^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415764 + ... + 2136556.

Almost surely, 2^{1280243694880} is an apocalyptic number.

1280243694880 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 1280243694880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603700336952).

1280243694880 is an abundant number, since it is smaller than the sum of its proper divisors (1927156979024).

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

1280243694880 is a wasteful number, since it uses less digits than its factorization.

1280243694880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721478 (or 721470 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 1280243694880 in words is "one trillion, two hundred eighty billion, two hundred forty-three million, six hundred ninety-four thousand, eight hundred eighty".