128643527 has 8 divisors (see below), whose sum is σ = 132735120. Its totient is φ = 124597440.

The previous prime is 128643497. The next prime is 128643533. The reversal of 128643527 is 725346821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128643527 - 2¹⁶ = 128577991 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 (128643227) 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 in 7 ways as a sum of consecutive naturals, for example, 5588 + ... + 16985.

It is an arithmetic number, because the mean of its divisors is an integer number (16591890).

Almost surely, 2^128643527 is an apocalyptic number.

128643527 is a deficient number, since it is larger than the sum of its proper divisors (4091593).

128643527 is a wasteful number, since it uses less digits than its factorization.

128643527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22753.

The product of its digits is 80640, while the sum is 38.

The square root of 128643527 is about 11342.1129865647. The cubic root of 128643527 is about 504.8115847776.

The spelling of 128643527 in words is "one hundred twenty-eight million, six hundred forty-three thousand, five hundred twenty-seven".