128812687 has 2 divisors, whose sum is σ = 128812688. Its totient is φ = 128812686.

The previous prime is 128812669. The next prime is 128812703. The reversal of 128812687 is 786218821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128812687 - 2⁷ = 128812559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128812087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64406343 + 64406344.

It is an arithmetic number, because the mean of its divisors is an integer number (64406344).

Almost surely, 2^128812687 is an apocalyptic number.

128812687 is a deficient number, since it is larger than the sum of its proper divisors (1).

128812687 is an equidigital number, since it uses as much as digits as its factorization.

128812687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 128812687 is about 11349.5677010184. The cubic root of 128812687 is about 505.0327554481.

The spelling of 128812687 in words is "one hundred twenty-eight million, eight hundred twelve thousand, six hundred eighty-seven".