128721549704160 has 384 divisors, whose sum is σ = 464127607480320. Its totient is φ = 29375748532224.

The previous prime is 128721549704149. The next prime is 128721549704173. The reversal of 128721549704160 is 61407945127821.

128721549704160 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 128721549704160.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7686236907 + ... + 7686253653.

It is an arithmetic number, because the mean of its divisors is an integer number (1208665644480).

Almost surely, 2^{128721549704160} is an apocalyptic number.

128721549704160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128721549704160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232063803740160).

128721549704160 is an abundant number, since it is smaller than the sum of its proper divisors (335406057776160).

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

128721549704160 is a wasteful number, since it uses less digits than its factorization.

128721549704160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20238 (or 20230 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 128721549704160 in words is "one hundred twenty-eight trillion, seven hundred twenty-one billion, five hundred forty-nine million, seven hundred four thousand, one hundred sixty".