128403072 has 96 divisors (see below), whose sum is σ = 422304480. Its totient is φ = 36684288.

The previous prime is 128402999. The next prime is 128403133. The reversal of 128403072 is 270304821.

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 11 ways as a sum of consecutive naturals, for example, 103 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (4399005).

Almost surely, 2^128403072 is an apocalyptic number.

128403072 is a gapful number since it is divisible by the number (12) 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 128403072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211152240).

128403072 is an abundant number, since it is smaller than the sum of its proper divisors (293901408).

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

128403072 is a wasteful number, since it uses less digits than its factorization.

128403072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15950 (or 15935 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 128403072 is about 11331.5079314273. The cubic root of 128403072 is about 504.4968645064.

Adding to 128403072 its reverse (270304821), we get a palindrome (398707893).

The spelling of 128403072 in words is "one hundred twenty-eight million, four hundred three thousand, seventy-two".