128405475 has 72 divisors (see below), whose sum is σ = 259693200. Its totient is φ = 60076800.

The previous prime is 128405443. The next prime is 128405489. The reversal of 128405475 is 574504821.

It is not a de Polignac number, because 128405475 - 2⁵ = 128405443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 70881 + ... + 72669.

It is an arithmetic number, because the mean of its divisors is an integer number (3606850).

Almost surely, 2^128405475 is an apocalyptic number.

128405475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128405475 is an abundant number, since it is smaller than the sum of its proper divisors (131287725).

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

128405475 is a wasteful number, since it uses less digits than its factorization.

128405475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 128405475 is about 11331.6139627151. The cubic root of 128405475 is about 504.5000116232.

The spelling of 128405475 in words is "one hundred twenty-eight million, four hundred five thousand, four hundred seventy-five".