128868087 has 4 divisors (see below), whose sum is σ = 171824120. Its totient is φ = 85912056.

The previous prime is 128868071. The next prime is 128868101. The reversal of 128868087 is 780868821.

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

It is not a de Polignac number, because 128868087 - 2⁴ = 128868071 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 (128868587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21478012 + ... + 21478017.

It is an arithmetic number, because the mean of its divisors is an integer number (42956030).

Almost surely, 2^128868087 is an apocalyptic number.

128868087 is a deficient number, since it is larger than the sum of its proper divisors (42956033).

128868087 is an equidigital number, since it uses as much as digits as its factorization.

128868087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42956032.

The product of its (nonzero) digits is 344064, while the sum is 48.

The square root of 128868087 is about 11352.0080602508. The cubic root of 128868087 is about 505.1051468800.

The spelling of 128868087 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, eighty-seven".