128818944 has 72 divisors (see below), whose sum is σ = 380960720. Its totient is φ = 42937344.

The previous prime is 128818933. The next prime is 128818951. The reversal of 128818944 is 449818821.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 128818944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407 + ... + 16230.

Almost surely, 2^128818944 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 128818944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190480360).

128818944 is an abundant number, since it is smaller than the sum of its proper divisors (252141776).

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

128818944 is an equidigital number, since it uses as much as digits as its factorization.

128818944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18662 (or 18642 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 128818944 is about 11349.8433469366. The cubic root of 128818944 is about 505.0409325381.

The spelling of 128818944 in words is "one hundred twenty-eight million, eight hundred eighteen thousand, nine hundred forty-four".