128507512 has 64 divisors (see below), whose sum is σ = 285912000. Its totient is φ = 53001216.

The previous prime is 128507479. The next prime is 128507513. The reversal of 128507512 is 215705821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128507513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225564 + ... + 226132.

It is an arithmetic number, because the mean of its divisors is an integer number (4467375).

Almost surely, 2^128507512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128507512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142956000).

128507512 is an abundant number, since it is smaller than the sum of its proper divisors (157404488).

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

128507512 is a wasteful number, since it uses less digits than its factorization.

128507512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 128507512 is about 11336.1153840282. The cubic root of 128507512 is about 504.6336093486.

The spelling of 128507512 in words is "one hundred twenty-eight million, five hundred seven thousand, five hundred twelve".