12708731720 has 16 divisors (see below), whose sum is σ = 28594646460. Its totient is φ = 5083492672.

The previous prime is 12708731687. The next prime is 12708731731. The reversal of 12708731720 is 2713780721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11638525924 + 1070205796 = 107882^2 + 32714^2 .

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, 158859107 + ... + 158859186.

Almost surely, 2^12708731720 is an apocalyptic number.

12708731720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12708731720 is an abundant number, since it is smaller than the sum of its proper divisors (15885914740).

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

12708731720 is a wasteful number, since it uses less digits than its factorization.

12708731720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317718304 (or 317718300 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The spelling of 12708731720 in words is "twelve billion, seven hundred eight million, seven hundred thirty-one thousand, seven hundred twenty".