128665044 has 48 divisors (see below), whose sum is σ = 353203200. Its totient is φ = 40364928.

The previous prime is 128664961. The next prime is 128665081. The reversal of 128665044 is 440566821.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

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, 33204 + ... + 36875.

It is an arithmetic number, because the mean of its divisors is an integer number (7358400).

Almost surely, 2^128665044 is an apocalyptic number.

It is an amenable number.

128665044 is an abundant number, since it is smaller than the sum of its proper divisors (224538156).

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

128665044 is a wasteful number, since it uses less digits than its factorization.

128665044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70109 (or 70101 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 128665044 is about 11343.0614915022. The cubic root of 128665044 is about 504.8397282466.

The spelling of 128665044 in words is "one hundred twenty-eight million, six hundred sixty-five thousand, forty-four".