1278127389320 has 32 divisors (see below), whose sum is σ = 2875855999320. Its totient is φ = 511238622720.

The previous prime is 1278127389293. The next prime is 1278127389349. The reversal of 1278127389320 is 239837218721.

It can be written as a sum of positive squares in 4 ways, for example, as 820991839396 + 457135549924 = 906086^2 + 676118^2 .

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 7 ways as a sum of consecutive naturals, for example, 1395014 + ... + 2121866.

Almost surely, 2^{1278127389320} is an apocalyptic number.

1278127389320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278127389320 is an abundant number, since it is smaller than the sum of its proper divisors (1597728610000).

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

1278127389320 is a wasteful number, since it uses less digits than its factorization.

1278127389320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770825 (or 770821 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 1278127389320 in words is "one trillion, two hundred seventy-eight billion, one hundred twenty-seven million, three hundred eighty-nine thousand, three hundred twenty".