128655456 has 96 divisors (see below), whose sum is σ = 369266688. Its totient is φ = 39045120.

The previous prime is 128655451. The next prime is 128655509. The reversal of 128655456 is 654556821.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128655451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49321 + ... + 51863.

It is an arithmetic number, because the mean of its divisors is an integer number (3846528).

Almost surely, 2^128655456 is an apocalyptic number.

128655456 is a gapful number since it is divisible by the number (16) 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 128655456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184633344).

128655456 is an abundant number, since it is smaller than the sum of its proper divisors (240611232).

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

128655456 is a wasteful number, since it uses less digits than its factorization.

128655456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604 (or 2596 counting only the distinct ones).

The product of its digits is 288000, while the sum is 42.

The square root of 128655456 is about 11342.6388464061. The cubic root of 128655456 is about 504.8271878720.

The spelling of 128655456 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, four hundred fifty-six".