128771677 has 2 divisors, whose sum is σ = 128771678. Its totient is φ = 128771676.

The previous prime is 128771663. The next prime is 128771701. The reversal of 128771677 is 776177821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111640356 + 17131321 = 10566^2 + 4139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128771677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128771647) 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, 64385838 + 64385839.

It is an arithmetic number, because the mean of its divisors is an integer number (64385839).

Almost surely, 2^128771677 is an apocalyptic number.

It is an amenable number.

128771677 is a deficient number, since it is larger than the sum of its proper divisors (1).

128771677 is an equidigital number, since it uses as much as digits as its factorization.

128771677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230496, while the sum is 46.

The square root of 128771677 is about 11347.7608804557. The cubic root of 128771677 is about 504.9791541243.

The spelling of 128771677 in words is "one hundred twenty-eight million, seven hundred seventy-one thousand, six hundred seventy-seven".