128677 has 2 divisors, whose sum is σ = 128678. Its totient is φ = 128676.

The previous prime is 128669. The next prime is 128683. The reversal of 128677 is 776821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123201 + 5476 = 351^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 128677 - 2³ = 128669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64338 + 64339.

It is an arithmetic number, because the mean of its divisors is an integer number (64339).

2¹²⁸⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

128677 is a deficient number, since it is larger than the sum of its proper divisors (1).

128677 is an equidigital number, since it uses as much as digits as its factorization.

128677 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 128677 is about 358.7157649170. The cubic root of 128677 is about 50.4855364912.

The spelling of 128677 in words is "one hundred twenty-eight thousand, six hundred seventy-seven".