128580491 has 8 divisors (see below), whose sum is σ = 141084720. Its totient is φ = 116449632.

The previous prime is 128580457. The next prime is 128580493. The reversal of 128580491 is 194085821.

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

It is not a de Polignac number, because 128580491 - 2¹⁸ = 128318347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128580493) 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, 92621 + ... + 93998.

It is an arithmetic number, because the mean of its divisors is an integer number (17635590).

Almost surely, 2^128580491 is an apocalyptic number.

128580491 is a deficient number, since it is larger than the sum of its proper divisors (12504229).

128580491 is a wasteful number, since it uses less digits than its factorization.

128580491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186685.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 128580491 is about 11339.3337987732. Note that the first 3 decimals coincide. The cubic root of 128580491 is about 504.7291178689.

The spelling of 128580491 in words is "one hundred twenty-eight million, five hundred eighty thousand, four hundred ninety-one".