128273571 has 8 divisors (see below), whose sum is σ = 190034960. Its totient is φ = 85515696.

The previous prime is 128273569. The next prime is 128273591. The reversal of 128273571 is 175372821.

128273571 is a `hidden beast` number, since 1 + 2 + 82 + 7 + 3 + 571 = 666.

It is not a de Polignac number, because 128273571 - 2¹ = 128273569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128273501) 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, 2375410 + ... + 2375463.

It is an arithmetic number, because the mean of its divisors is an integer number (23754370).

Almost surely, 2^128273571 is an apocalyptic number.

128273571 is a deficient number, since it is larger than the sum of its proper divisors (61761389).

128273571 is an equidigital number, since it uses as much as digits as its factorization.

128273571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750882 (or 4750876 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 128273571 is about 11325.7922901667. The cubic root of 128273571 is about 504.3272039119.

The spelling of 128273571 in words is "one hundred twenty-eight million, two hundred seventy-three thousand, five hundred seventy-one".