12729991000 has 64 divisors (see below), whose sum is σ = 31540466880. Its totient is φ = 4792460800.

The previous prime is 12729990967. The next prime is 12729991009. The reversal of 12729991000 is 19992721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729991009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 357412 + ... + 391411.

It is an arithmetic number, because the mean of its divisors is an integer number (492819795).

Almost surely, 2^12729991000 is an apocalyptic number.

12729991000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12729991000 is an abundant number, since it is smaller than the sum of its proper divisors (18810475880).

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

12729991000 is a wasteful number, since it uses less digits than its factorization.

12729991000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748861 (or 748847 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 40.

The spelling of 12729991000 in words is "twelve billion, seven hundred twenty-nine million, nine hundred ninety-one thousand".