1278536527872 has 208 divisors, whose sum is σ = 3791991341280. Its totient is φ = 425706651648.

The previous prime is 1278536527783. The next prime is 1278536527909. The reversal of 1278536527872 is 2787256358721.

It is a happy number.

1278536527872 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 5 + 36 + 527 + 8 + 72 = 666.

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, 108042468 + ... + 108054300.

Almost surely, 2^{1278536527872} is an apocalyptic number.

1278536527872 is a gapful number since it is divisible by the number (12) 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 1278536527872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1895995670640).

1278536527872 is an abundant number, since it is smaller than the sum of its proper divisors (2513454813408).

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

1278536527872 is an equidigital number, since it uses as much as digits as its factorization.

1278536527872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843 (or 12815 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The spelling of 1278536527872 in words is "one trillion, two hundred seventy-eight billion, five hundred thirty-six million, five hundred twenty-seven thousand, eight hundred seventy-two".