128409696 has 72 divisors (see below), whose sum is σ = 373693320. Its totient is φ = 41803776.

The previous prime is 128409691. The next prime is 128409703. The reversal of 128409696 is 696904821.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128409691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7200 + ... + 17568.

It is an arithmetic number, because the mean of its divisors is an integer number (5190185).

Almost surely, 2^128409696 is an apocalyptic number.

128409696 is a gapful number since it is divisible by the number (16) 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 128409696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186846660).

128409696 is an abundant number, since it is smaller than the sum of its proper divisors (245283624).

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

128409696 is a wasteful number, since it uses less digits than its factorization.

128409696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428 (or 10417 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 128409696 is about 11331.8002100284. The cubic root of 128409696 is about 504.5055396097.

The spelling of 128409696 in words is "one hundred twenty-eight million, four hundred nine thousand, six hundred ninety-six".