128084640 has 96 divisors (see below), whose sum is σ = 405155520. Its totient is φ = 34013184.

The previous prime is 128084633. The next prime is 128084669. The reversal of 128084640 is 46480821.

It is a tau number, because it is divible by the number of its divisors (96).

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, 166176 + ... + 166944.

It is an arithmetic number, because the mean of its divisors is an integer number (4220370).

Almost surely, 2^128084640 is an apocalyptic number.

128084640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128084640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202577760).

128084640 is an abundant number, since it is smaller than the sum of its proper divisors (277070880).

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

128084640 is a wasteful number, since it uses less digits than its factorization.

128084640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 128084640 is about 11317.4484756945. The cubic root of 128084640 is about 504.0794785216.

The spelling of 128084640 in words is "one hundred twenty-eight million, eighty-four thousand, six hundred forty".