12780729680 has 20 divisors (see below), whose sum is σ = 29715196692. Its totient is φ = 5112291840.

The previous prime is 12780729617. The next prime is 12780729691. The reversal of 12780729680 is 8692708721.

It can be written as a sum of positive squares in 2 ways, for example, as 7816681744 + 4964047936 = 88412^2 + 70456^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 79879481 + ... + 79879640.

Almost surely, 2^12780729680 is an apocalyptic number.

12780729680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12780729680 is an abundant number, since it is smaller than the sum of its proper divisors (16934467012).

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

12780729680 is a wasteful number, since it uses less digits than its factorization.

12780729680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159759134 (or 159759128 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 12780729680 in words is "twelve billion, seven hundred eighty million, seven hundred twenty-nine thousand, six hundred eighty".