128440440 has 192 divisors, whose sum is σ = 456917760. Its totient is φ = 31150080.

The previous prime is 128440427. The next prime is 128440451. The reversal of 128440440 is 44044821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189382 + ... + 190058.

It is an arithmetic number, because the mean of its divisors is an integer number (2379780).

Almost surely, 2^128440440 is an apocalyptic number.

128440440 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 128440440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228458880).

128440440 is an abundant number, since it is smaller than the sum of its proper divisors (328477320).

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

128440440 is a wasteful number, since it uses less digits than its factorization.

128440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 128440440 is about 11333.1566652897. The cubic root of 128440440 is about 504.5457994995.

The spelling of 128440440 in words is "one hundred twenty-eight million, four hundred forty thousand, four hundred forty".