128523712 has 56 divisors (see below), whose sum is σ = 262707120. Its totient is φ = 62361600.

The previous prime is 128523691. The next prime is 128523713. The reversal of 128523712 is 217325821.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128523713) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 381208 + ... + 381544.

Almost surely, 2^128523712 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 128523712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131353560).

128523712 is an abundant number, since it is smaller than the sum of its proper divisors (134183408).

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

128523712 is a wasteful number, since it uses less digits than its factorization.

128523712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 499 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 128523712 is about 11336.8298919936. The cubic root of 128523712 is about 504.6548136109.

The spelling of 128523712 in words is "one hundred twenty-eight million, five hundred twenty-three thousand, seven hundred twelve".