11720281220928 has 280 divisors, whose sum is σ = 40516140456000. Its totient is φ = 3348651269376.

The previous prime is 11720281220917. The next prime is 11720281220929. The reversal of 11720281220928 is 82902218202711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11720281220929) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1517598 + ... + 5073821.

Almost surely, 2^{11720281220928} is an apocalyptic number.

11720281220928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11720281220928 is an abundant number, since it is smaller than the sum of its proper divisors (28795859235072).

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

11720281220928 is an frugal number, since it uses more digits than its factorization.

11720281220928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591464 (or 6591431 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 11720281220928 in words is "eleven trillion, seven hundred twenty billion, two hundred eighty-one million, two hundred twenty thousand, nine hundred twenty-eight".