128765512 has 16 divisors (see below), whose sum is σ = 243693360. Its totient is φ = 63780624.

The previous prime is 128765509. The next prime is 128765519. The reversal of 128765512 is 215567821.

It is not an unprimeable number, because it can be changed into a prime (128765519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74358 + ... + 76069.

It is an arithmetic number, because the mean of its divisors is an integer number (15230835).

Almost surely, 2^128765512 is an apocalyptic number.

It is an amenable number.

128765512 is a deficient number, since it is larger than the sum of its proper divisors (114927848).

128765512 is a wasteful number, since it uses less digits than its factorization.

128765512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150540 (or 150536 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 128765512 is about 11347.4892377125. The cubic root of 128765512 is about 504.9710952969.

The spelling of 128765512 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, five hundred twelve".