128447872 has 32 divisors (see below), whose sum is σ = 292450320. Its totient is φ = 55048704.

The previous prime is 128447857. The next prime is 128447941. The reversal of 128447872 is 278744821.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70783 + ... + 72574.

Almost surely, 2^128447872 is an apocalyptic number.

It is an amenable number.

128447872 is an abundant number, since it is smaller than the sum of its proper divisors (164002448).

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

128447872 is an equidigital number, since it uses as much as digits as its factorization.

128447872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143378 (or 143366 counting only the distinct ones).

The product of its digits is 200704, while the sum is 43.

The square root of 128447872 is about 11333.4845480108. The cubic root of 128447872 is about 504.5555308896. Note that the first 4 decimals are identical.

The spelling of 128447872 in words is "one hundred twenty-eight million, four hundred forty-seven thousand, eight hundred seventy-two".