12729437520 has 40 divisors (see below), whose sum is σ = 39461257056. Its totient is φ = 3394516608.

The previous prime is 12729437419. The next prime is 12729437521. The reversal of 12729437520 is 2573492721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729437521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26519422 + ... + 26519901.

Almost surely, 2^12729437520 is an apocalyptic number.

12729437520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12729437520 is an abundant number, since it is smaller than the sum of its proper divisors (26731819536).

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

12729437520 is a wasteful number, since it uses less digits than its factorization.

12729437520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53039339 (or 53039333 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 12729437520 in words is "twelve billion, seven hundred twenty-nine million, four hundred thirty-seven thousand, five hundred twenty".