128747591 has 8 divisors (see below), whose sum is σ = 154884480. Its totient is φ = 104546808.

The previous prime is 128747587. The next prime is 128747599. The reversal of 128747591 is 195747821.

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 128747591 - 2² = 128747587 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 (128747599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483881 + ... + 484146.

It is an arithmetic number, because the mean of its divisors is an integer number (19360560).

Almost surely, 2^128747591 is an apocalyptic number.

128747591 is a deficient number, since it is larger than the sum of its proper divisors (26136889).

128747591 is an equidigital number, since it uses as much as digits as its factorization.

128747591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968053.

The product of its digits is 141120, while the sum is 44.

The square root of 128747591 is about 11346.6995641905. The cubic root of 128747591 is about 504.9476676810.

The spelling of 128747591 in words is "one hundred twenty-eight million, seven hundred forty-seven thousand, five hundred ninety-one".