128686367 has 2 divisors, whose sum is σ = 128686368. Its totient is φ = 128686366.

The previous prime is 128686319. The next prime is 128686391. The reversal of 128686367 is 763686821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128686367 - 2⁶ = 128686303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128686307) 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, 64343183 + 64343184.

It is an arithmetic number, because the mean of its divisors is an integer number (64343184).

Almost surely, 2^128686367 is an apocalyptic number.

128686367 is a deficient number, since it is larger than the sum of its proper divisors (1).

128686367 is an equidigital number, since it uses as much as digits as its factorization.

128686367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 128686367 is about 11344.0013663610. The cubic root of 128686367 is about 504.8676148753.

The spelling of 128686367 in words is "one hundred twenty-eight million, six hundred eighty-six thousand, three hundred sixty-seven".