128812727 has 4 divisors (see below), whose sum is σ = 130063440. Its totient is φ = 127562016.

The previous prime is 128812721. The next prime is 128812741. The reversal of 128812727 is 727218821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128812727 - 2¹⁶ = 128747191 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 (128812721) 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 3 ways as a sum of consecutive naturals, for example, 625202 + ... + 625407.

It is an arithmetic number, because the mean of its divisors is an integer number (32515860).

Almost surely, 2^128812727 is an apocalyptic number.

128812727 is a deficient number, since it is larger than the sum of its proper divisors (1250713).

128812727 is a wasteful number, since it uses less digits than its factorization.

128812727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250712.

The product of its digits is 25088, while the sum is 38.

The square root of 128812727 is about 11349.5694631999. The cubic root of 128812727 is about 505.0328077238.

The spelling of 128812727 in words is "one hundred twenty-eight million, eight hundred twelve thousand, seven hundred twenty-seven".