128511647 has 12 divisors (see below), whose sum is σ = 144874728. Its totient is φ = 113050800.

The previous prime is 128511637. The next prime is 128511659. The reversal of 128511647 is 746115821.

It is not a de Polignac number, because 128511647 - 2⁴ = 128511631 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 (128511637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4493 + ... + 16649.

It is an arithmetic number, because the mean of its divisors is an integer number (12072894).

Almost surely, 2^128511647 is an apocalyptic number.

128511647 is a deficient number, since it is larger than the sum of its proper divisors (16363081).

128511647 is a wasteful number, since it uses less digits than its factorization.

128511647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12230 (or 12199 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 128511647 is about 11336.2977642615. The cubic root of 128511647 is about 504.6390218405.

The spelling of 128511647 in words is "one hundred twenty-eight million, five hundred eleven thousand, six hundred forty-seven".