128533956 has 24 divisors (see below), whose sum is σ = 301929600. Its totient is φ = 42556512.

The previous prime is 128533949. The next prime is 128533973. The reversal of 128533956 is 659335821.

It is an unprimeable number.

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, 34156 + ... + 37731.

It is an arithmetic number, because the mean of its divisors is an integer number (12580400).

Almost surely, 2^128533956 is an apocalyptic number.

It is an amenable number.

128533956 is an abundant number, since it is smaller than the sum of its proper divisors (173395644).

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

128533956 is a wasteful number, since it uses less digits than its factorization.

128533956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72043 (or 72041 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 128533956 is about 11337.2816847779. The cubic root of 128533956 is about 504.6682211149.

The spelling of 128533956 in words is "one hundred twenty-eight million, five hundred thirty-three thousand, nine hundred fifty-six".