128910587 has 4 divisors (see below), whose sum is σ = 138826800. Its totient is φ = 118994376.

The previous prime is 128910571. The next prime is 128910589. The reversal of 128910587 is 785019821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785019821 = 29 ⋅27069649.

It is a cyclic number.

It is not a de Polignac number, because 128910587 - 2⁴ = 128910571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128910589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4958087 + ... + 4958112.

It is an arithmetic number, because the mean of its divisors is an integer number (34706700).

Almost surely, 2^128910587 is an apocalyptic number.

128910587 is a deficient number, since it is larger than the sum of its proper divisors (9916213).

128910587 is an equidigital number, since it uses as much as digits as its factorization.

128910587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9916212.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 128910587 is about 11353.8798214531. The cubic root of 128910587 is about 505.1606677613.

The spelling of 128910587 in words is "one hundred twenty-eight million, nine hundred ten thousand, five hundred eighty-seven".