128506912 has 12 divisors (see below), whose sum is σ = 252998046. Its totient is φ = 64253440.

The previous prime is 128506907. The next prime is 128506913. The reversal of 128506912 is 219605821.

It can be written as a sum of positive squares in only one way, i.e., 102333456 + 26173456 = 10116^2 + 5116^2 .

It is not an unprimeable number, because it can be changed into a prime (128506913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2007889 + ... + 2007952.

Almost surely, 2^128506912 is an apocalyptic number.

It is an amenable number.

128506912 is a deficient number, since it is larger than the sum of its proper divisors (124491134).

128506912 is an equidigital number, since it uses as much as digits as its factorization.

128506912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015851 (or 4015843 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 128506912 is about 11336.0889199053. The cubic root of 128506912 is about 504.6328239713.

The spelling of 128506912 in words is "one hundred twenty-eight million, five hundred six thousand, nine hundred twelve".