128582867 has 4 divisors (see below), whose sum is σ = 146951856. Its totient is φ = 110213880.

The previous prime is 128582833. The next prime is 128582869. The reversal of 128582867 is 768285821.

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

It is not a de Polignac number, because 128582867 - 2⁶ = 128582803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128582869) 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 3 ways as a sum of consecutive naturals, for example, 9184484 + ... + 9184497.

It is an arithmetic number, because the mean of its divisors is an integer number (36737964).

Almost surely, 2^128582867 is an apocalyptic number.

128582867 is a deficient number, since it is larger than the sum of its proper divisors (18368989).

128582867 is an equidigital number, since it uses as much as digits as its factorization.

128582867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18368988.

The product of its digits is 430080, while the sum is 47.

The square root of 128582867 is about 11339.4385663489. The cubic root of 128582867 is about 504.7322267620.

The spelling of 128582867 in words is "one hundred twenty-eight million, five hundred eighty-two thousand, eight hundred sixty-seven".