1278443320000 has 1120 divisors, whose sum is σ = 4147762291200. Its totient is φ = 387233280000.

The previous prime is 1278443319997. The next prime is 1278443320009. The reversal of 1278443320000 is 233448721.

It is a tau number, because it is divible by the number of its divisors (1120).

It is not an unprimeable number, because it can be changed into a prime (1278443320009) by changing a digit.

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 159 ways as a sum of consecutive naturals, for example, 6489559902 + ... + 6489560098.

Almost surely, 2^{1278443320000} is an apocalyptic number.

1278443320000 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 1278443320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073881145600).

1278443320000 is an abundant number, since it is smaller than the sum of its proper divisors (2869318971200).

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

1278443320000 is an equidigital number, since it uses as much as digits as its factorization.

1278443320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

Adding to 1278443320000 its reverse (233448721), we get a palindrome (1278676768721).

The spelling of 1278443320000 in words is "one trillion, two hundred seventy-eight billion, four hundred forty-three million, three hundred twenty thousand".