128427547 has 4 divisors (see below), whose sum is σ = 131160096. Its totient is φ = 125695000.

The previous prime is 128427529. The next prime is 128427557. The reversal of 128427547 is 745724821.

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 128427547 - 2⁷ = 128427419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128427557) 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, 1366204 + ... + 1366297.

It is an arithmetic number, because the mean of its divisors is an integer number (32790024).

Almost surely, 2^128427547 is an apocalyptic number.

128427547 is a deficient number, since it is larger than the sum of its proper divisors (2732549).

128427547 is an equidigital number, since it uses as much as digits as its factorization.

128427547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732548.

The product of its digits is 125440, while the sum is 40.

The square root of 128427547 is about 11332.5878333239. The cubic root of 128427547 is about 504.5289166375.

The spelling of 128427547 in words is "one hundred twenty-eight million, four hundred twenty-seven thousand, five hundred forty-seven".