12781724020 has 24 divisors (see below), whose sum is σ = 28906361064. Its totient is φ = 4719405696.

The previous prime is 12781724009. The next prime is 12781724041. The reversal of 12781724020 is 2042718721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 543169636 + 12238554384 = 23306^2 + 110628^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24579979 + ... + 24580498.

It is an arithmetic number, because the mean of its divisors is an integer number (1204431711).

Almost surely, 2^12781724020 is an apocalyptic number.

12781724020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12781724020 is an abundant number, since it is smaller than the sum of its proper divisors (16124637044).

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

12781724020 is a wasteful number, since it uses less digits than its factorization.

12781724020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49160499 (or 49160497 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The spelling of 12781724020 in words is "twelve billion, seven hundred eighty-one million, seven hundred twenty-four thousand, twenty".