128809487 has 2 divisors, whose sum is σ = 128809488. Its totient is φ = 128809486.

The previous prime is 128809481. The next prime is 128809511. The reversal of 128809487 is 784908821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128809487 - 2⁶ = 128809423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128809481) 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, 64404743 + 64404744.

It is an arithmetic number, because the mean of its divisors is an integer number (64404744).

Almost surely, 2^128809487 is an apocalyptic number.

128809487 is a deficient number, since it is larger than the sum of its proper divisors (1).

128809487 is an equidigital number, since it uses as much as digits as its factorization.

128809487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 128809487 is about 11349.4267256104. The cubic root of 128809487 is about 505.0285733596.

The spelling of 128809487 in words is "one hundred twenty-eight million, eight hundred nine thousand, four hundred eighty-seven".