128027591 has 8 divisors (see below), whose sum is σ = 134097120. Its totient is φ = 122000032.

The previous prime is 128027587. The next prime is 128027609. The reversal of 128027591 is 195720821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128027591 - 2² = 128027587 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 (128027521) 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, 4160 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (16762140).

Almost surely, 2^128027591 is an apocalyptic number.

128027591 is a deficient number, since it is larger than the sum of its proper divisors (6069529).

128027591 is a wasteful number, since it uses less digits than its factorization.

128027591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20985.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 128027591 is about 11314.9277947321. The cubic root of 128027591 is about 504.0046282749.

The spelling of 128027591 in words is "one hundred twenty-eight million, twenty-seven thousand, five hundred ninety-one".