128405547 has 8 divisors (see below), whose sum is σ = 190230480. Its totient is φ = 85603680.

The previous prime is 128405521. The next prime is 128405569. The reversal of 128405547 is 745504821.

It is not a de Polignac number, because 128405547 - 2⁷ = 128405419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128405507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2377854 + ... + 2377907.

It is an arithmetic number, because the mean of its divisors is an integer number (23778810).

Almost surely, 2^128405547 is an apocalyptic number.

128405547 is a deficient number, since it is larger than the sum of its proper divisors (61824933).

128405547 is an equidigital number, since it uses as much as digits as its factorization.

128405547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755770 (or 4755764 counting only the distinct ones).

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

The square root of 128405547 is about 11331.6171396672. The cubic root of 128405547 is about 504.5001059182.

The spelling of 128405547 in words is "one hundred twenty-eight million, four hundred five thousand, five hundred forty-seven".