128006647 has 2 divisors, whose sum is σ = 128006648. Its totient is φ = 128006646.

The previous prime is 128006611. The next prime is 128006687. The reversal of 128006647 is 746600821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128006647 - 2¹¹ = 128004599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128006687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64003323 + 64003324.

It is an arithmetic number, because the mean of its divisors is an integer number (64003324).

Almost surely, 2^128006647 is an apocalyptic number.

128006647 is a deficient number, since it is larger than the sum of its proper divisors (1).

128006647 is an equidigital number, since it uses as much as digits as its factorization.

128006647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 128006647 is about 11314.0022538446. The cubic root of 128006647 is about 503.9771434478.

The spelling of 128006647 in words is "one hundred twenty-eight million, six thousand, six hundred forty-seven".