128472447 has 4 divisors (see below), whose sum is σ = 171296600. Its totient is φ = 85648296.

The previous prime is 128472437. The next prime is 128472467. The reversal of 128472447 is 744274821.

It is a happy number.

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

It is not a de Polignac number, because 128472447 - 2⁴ = 128472431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128472427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21412072 + ... + 21412077.

It is an arithmetic number, because the mean of its divisors is an integer number (42824150).

Almost surely, 2^128472447 is an apocalyptic number.

128472447 is a deficient number, since it is larger than the sum of its proper divisors (42824153).

128472447 is an equidigital number, since it uses as much as digits as its factorization.

128472447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42824152.

The product of its digits is 100352, while the sum is 39.

The square root of 128472447 is about 11334.5686728697. The cubic root of 128472447 is about 504.5877064881.

The spelling of 128472447 in words is "one hundred twenty-eight million, four hundred seventy-two thousand, four hundred forty-seven".