128236647 has 48 divisors (see below), whose sum is σ = 217226240. Its totient is φ = 65862720.

The previous prime is 128236631. The next prime is 128236673. The reversal of 128236647 is 746632821.

It is a happy number.

It is not a de Polignac number, because 128236647 - 2⁴ = 128236631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128236687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 276738 + ... + 277200.

Almost surely, 2^128236647 is an apocalyptic number.

128236647 is a deficient number, since it is larger than the sum of its proper divisors (88989593).

128236647 is a wasteful number, since it uses less digits than its factorization.

128236647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 593 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 128236647 is about 11324.1620882077. The cubic root of 128236647 is about 504.2788084796.

The spelling of 128236647 in words is "one hundred twenty-eight million, two hundred thirty-six thousand, six hundred forty-seven".