128655072 has 144 divisors (see below), whose sum is σ = 450384480. Its totient is φ = 33924096.

The previous prime is 128655067. The next prime is 128655091. The reversal of 128655072 is 270556821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23754 + ... + 28662.

It is an arithmetic number, because the mean of its divisors is an integer number (3127670).

Almost surely, 2^128655072 is an apocalyptic number.

128655072 is a gapful number since it is divisible by the number (12) 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 128655072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225192240).

128655072 is an abundant number, since it is smaller than the sum of its proper divisors (321729408).

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

128655072 is a wasteful number, since it uses less digits than its factorization.

128655072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945 (or 4934 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 128655072 is about 11342.6219191155. The cubic root of 128655072 is about 504.8266856162.

The spelling of 128655072 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, seventy-two".