12720133908 has 54 divisors (see below), whose sum is σ = 33935073354. Its totient is φ = 4016880288.

The previous prime is 12720133883. The next prime is 12720133913. The reversal of 12720133908 is 80933102721.

It can be written as a sum of positive squares in only one way, i.e., 11927260944 + 792872964 = 109212^2 + 28158^2 .

It is a super-3 number, since 3×12720133908³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 17 ways as a sum of consecutive naturals, for example, 476391 + ... + 502382.

Almost surely, 2^12720133908 is an apocalyptic number.

12720133908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12720133908 is an abundant number, since it is smaller than the sum of its proper divisors (21214939446).

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

12720133908 is a wasteful number, since it uses less digits than its factorization.

12720133908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978821 (or 978797 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 12720133908 in words is "twelve billion, seven hundred twenty million, one hundred thirty-three thousand, nine hundred eight".