128728448 has 32 divisors (see below), whose sum is σ = 265302000. Its totient is φ = 62142976.

The previous prime is 128728433. The next prime is 128728451. The reversal of 128728448 is 844827821.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 128728399 and 128728408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13628 + ... + 21051.

Almost surely, 2^128728448 is an apocalyptic number.

It is an amenable number.

128728448 is an abundant number, since it is smaller than the sum of its proper divisors (136573552).

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

128728448 is an equidigital number, since it uses as much as digits as its factorization.

128728448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34722 (or 34710 counting only the distinct ones).

The product of its digits is 229376, while the sum is 44.

The square root of 128728448 is about 11345.8559835739. The cubic root of 128728448 is about 504.9226401776.

The spelling of 128728448 in words is "one hundred twenty-eight million, seven hundred twenty-eight thousand, four hundred forty-eight".