128656679 has 2 divisors, whose sum is σ = 128656680. Its totient is φ = 128656678.

The previous prime is 128656667. The next prime is 128656711. The reversal of 128656679 is 976656821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128656679 - 2¹⁶ = 128591143 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128656609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64328339 + 64328340.

It is an arithmetic number, because the mean of its divisors is an integer number (64328340).

Almost surely, 2^128656679 is an apocalyptic number.

128656679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128656679 is an equidigital number, since it uses as much as digits as its factorization.

128656679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 128656679 is about 11342.6927578948. The cubic root of 128656679 is about 504.8287874976.

The spelling of 128656679 in words is "one hundred twenty-eight million, six hundred fifty-six thousand, six hundred seventy-nine".