128099087 has 4 divisors (see below), whose sum is σ = 128138640. Its totient is φ = 128059536.

The previous prime is 128099057. The next prime is 128099113. The reversal of 128099087 is 780990821.

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

It is a cyclic number.

It is not a de Polignac number, because 128099087 - 2¹⁶ = 128033551 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 (128099057) 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, 14438 + ... + 21555.

It is an arithmetic number, because the mean of its divisors is an integer number (32034660).

Almost surely, 2^128099087 is an apocalyptic number.

128099087 is a deficient number, since it is larger than the sum of its proper divisors (39553).

128099087 is an equidigital number, since it uses as much as digits as its factorization.

128099087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39552.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 128099087 is about 11318.0867199364. The cubic root of 128099087 is about 504.0984299547.

The spelling of 128099087 in words is "one hundred twenty-eight million, ninety-nine thousand, eighty-seven".