128658679 has 2 divisors, whose sum is σ = 128658680. Its totient is φ = 128658678.

The previous prime is 128658661. The next prime is 128658743. The reversal of 128658679 is 976856821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128658679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128658659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64329339 + 64329340.

It is an arithmetic number, because the mean of its divisors is an integer number (64329340).

Almost surely, 2^128658679 is an apocalyptic number.

128658679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128658679 is an equidigital number, since it uses as much as digits as its factorization.

128658679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 128658679 is about 11342.7809200390. The cubic root of 128658679 is about 504.8314033803.

The spelling of 128658679 in words is "one hundred twenty-eight million, six hundred fifty-eight thousand, six hundred seventy-nine".