12781003780 has 12 divisors (see below), whose sum is σ = 26840107980. Its totient is φ = 5112401504.

The previous prime is 12781003769. The next prime is 12781003793. The reversal of 12781003780 is 8730018721.

It can be written as a sum of positive squares in 2 ways, for example, as 4718041344 + 8062962436 = 68688^2 + 89794^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319525075 + ... + 319525114.

It is an arithmetic number, because the mean of its divisors is an integer number (2236675665).

Almost surely, 2^12781003780 is an apocalyptic number.

12781003780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12781003780 is an abundant number, since it is smaller than the sum of its proper divisors (14059104200).

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

12781003780 is a wasteful number, since it uses less digits than its factorization.

12781003780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639050198 (or 639050196 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 12781003780 in words is "twelve billion, seven hundred eighty-one million, three thousand, seven hundred eighty".