128143065 has 16 divisors (see below), whose sum is σ = 206064000. Its totient is φ = 67997952.

The previous prime is 128143063. The next prime is 128143109. The reversal of 128143065 is 560341821.

It is not a de Polignac number, because 128143065 - 2¹ = 128143063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128143063) 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, 18480 + ... + 24449.

It is an arithmetic number, because the mean of its divisors is an integer number (12879000).

Almost surely, 2^128143065 is an apocalyptic number.

128143065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128143065 is a deficient number, since it is larger than the sum of its proper divisors (77920935).

128143065 is a wasteful number, since it uses less digits than its factorization.

128143065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43136.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 128143065 is about 11320.0293727534. The cubic root of 128143065 is about 504.1561110950.

Adding to 128143065 its reverse (560341821), we get a palindrome (688484886).

The spelling of 128143065 in words is "one hundred twenty-eight million, one hundred forty-three thousand, sixty-five".