128523564 has 48 divisors (see below), whose sum is σ = 358844640. Its totient is φ = 39545280.

The previous prime is 128523559. The next prime is 128523583. The reversal of 128523564 is 465325821.

128523564 is a `hidden beast` number, since 12 + 85 + 2 + 3 + 564 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44367 + ... + 47174.

It is an arithmetic number, because the mean of its divisors is an integer number (7475930).

Almost surely, 2^128523564 is an apocalyptic number.

It is an amenable number.

128523564 is an abundant number, since it is smaller than the sum of its proper divisors (230321076).

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

128523564 is a wasteful number, since it uses less digits than its factorization.

128523564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91567 (or 91559 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 128523564 is about 11336.8233645938. The cubic root of 128523564 is about 504.6546199010.

The spelling of 128523564 in words is "one hundred twenty-eight million, five hundred twenty-three thousand, five hundred sixty-four".