128530547 has 4 divisors (see below), whose sum is σ = 128632320. Its totient is φ = 128428776.

The previous prime is 128530537. The next prime is 128530559. The reversal of 128530547 is 745035821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128530547 - 2²⁶ = 61421683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128530517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48968 + ... + 51525.

It is an arithmetic number, because the mean of its divisors is an integer number (32158080).

Almost surely, 2^128530547 is an apocalyptic number.

128530547 is a deficient number, since it is larger than the sum of its proper divisors (101773).

128530547 is a wasteful number, since it uses less digits than its factorization.

128530547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101772.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 128530547 is about 11337.1313390999. The cubic root of 128530547 is about 504.6637594426.

The spelling of 128530547 in words is "one hundred twenty-eight million, five hundred thirty thousand, five hundred forty-seven".