128087 has 4 divisors (see below), whose sum is σ = 133680. Its totient is φ = 122496.

The previous prime is 128053. The next prime is 128099. The reversal of 128087 is 780821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780821 = 151 ⋅5171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128087.

It is not an unprimeable number, because it can be changed into a prime (128047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2762 + ... + 2807.

It is an arithmetic number, because the mean of its divisors is an integer number (33420).

2¹²⁸⁰⁸⁷ is an apocalyptic number.

128087 is a deficient number, since it is larger than the sum of its proper divisors (5593).

128087 is an equidigital number, since it uses as much as digits as its factorization.

128087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 128087 is about 357.8924419431. The cubic root of 128087 is about 50.4082574444.

The spelling of 128087 in words is "one hundred twenty-eight thousand, eighty-seven".