128767 has 2 divisors, whose sum is σ = 128768. Its totient is φ = 128766.

The previous prime is 128761. The next prime is 128813. The reversal of 128767 is 767821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128767 - 2¹¹ = 126719 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64383 + 64384.

It is an arithmetic number, because the mean of its divisors is an integer number (64384).

2¹²⁸⁷⁶⁷ is an apocalyptic number.

128767 is a deficient number, since it is larger than the sum of its proper divisors (1).

128767 is an equidigital number, since it uses as much as digits as its factorization.

128767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 128767 is about 358.8411905008. The cubic root of 128767 is about 50.4973040419.

The spelling of 128767 in words is "one hundred twenty-eight thousand, seven hundred sixty-seven".