128108887 has 16 divisors (see below), whose sum is σ = 141120000. Its totient is φ = 115853760.

The previous prime is 128108881. The next prime is 128108927. The reversal of 128108887 is 788801821.

It is a cyclic number.

It is not a de Polignac number, because 128108887 - 2³ = 128108879 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 (128108881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34864 + ... + 38362.

It is an arithmetic number, because the mean of its divisors is an integer number (8820000).

Almost surely, 2^128108887 is an apocalyptic number.

128108887 is a deficient number, since it is larger than the sum of its proper divisors (13011113).

128108887 is a wasteful number, since it uses less digits than its factorization.

128108887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606.

The product of its (nonzero) digits is 57344, while the sum is 43.

The square root of 128108887 is about 11318.5196470210. The cubic root of 128108887 is about 504.1112846876. Note that the first 3 decimals are identical.

The spelling of 128108887 in words is "one hundred twenty-eight million, one hundred eight thousand, eight hundred eighty-seven".