12781406740 has 12 divisors (see below), whose sum is σ = 26840954196. Its totient is φ = 5112562688.

The previous prime is 12781406719. The next prime is 12781406747. The reversal of 12781406740 is 4760418721.

It is a happy number.

12781406740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2161692036 + 10619714704 = 46494^2 + 103052^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12781406693 and 12781406702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781406747) 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 3 ways as a sum of consecutive naturals, for example, 319535149 + ... + 319535188.

It is an arithmetic number, because the mean of its divisors is an integer number (2236746183).

Almost surely, 2^12781406740 is an apocalyptic number.

12781406740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12781406740 is an abundant number, since it is smaller than the sum of its proper divisors (14059547456).

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

12781406740 is a wasteful number, since it uses less digits than its factorization.

12781406740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639070346 (or 639070344 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 12781406740 in words is "twelve billion, seven hundred eighty-one million, four hundred six thousand, seven hundred forty".