12781440000 has 660 divisors, whose sum is σ = 52872437904. Its totient is φ = 2912256000.

The previous prime is 12781439971. The next prime is 12781440037. The reversal of 12781440000 is 4418721.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 40319842 + ... + 40320158.

Almost surely, 2^12781440000 is an apocalyptic number.

12781440000 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 12781440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26436218952).

12781440000 is an abundant number, since it is smaller than the sum of its proper divisors (40090997904).

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

12781440000 is an equidigital number, since it uses as much as digits as its factorization.

12781440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

Adding to 12781440000 its reverse (4418721), we get a palindrome (12785858721).

The spelling of 12781440000 in words is "twelve billion, seven hundred eighty-one million, four hundred forty thousand".