128144187 has 20 divisors (see below), whose sum is σ = 192711376. Its totient is φ = 84855600.

The previous prime is 128144179. The next prime is 128144207. The reversal of 128144187 is 781441821.

It is not a de Polignac number, because 128144187 - 2³ = 128144179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128144117) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6993 + ... + 17469.

Almost surely, 2^128144187 is an apocalyptic number.

128144187 is a deficient number, since it is larger than the sum of its proper divisors (64567189).

128144187 is a wasteful number, since it uses less digits than its factorization.

128144187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10640 (or 10631 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 128144187 is about 11320.0789308202. The cubic root of 128144187 is about 504.1575825272.

The spelling of 128144187 in words is "one hundred twenty-eight million, one hundred forty-four thousand, one hundred eighty-seven".