128257699 has 2 divisors, whose sum is σ = 128257700. Its totient is φ = 128257698.

The previous prime is 128257687. The next prime is 128257817. The reversal of 128257699 is 996752821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128257699 - 2⁹ = 128257187 is a prime.

It is not a weakly prime, because it can be changed into another prime (128257669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64128849 + 64128850.

It is an arithmetic number, because the mean of its divisors is an integer number (64128850).

Almost surely, 2^128257699 is an apocalyptic number.

128257699 is a deficient number, since it is larger than the sum of its proper divisors (1).

128257699 is an equidigital number, since it uses as much as digits as its factorization.

128257699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 128257699 is about 11325.0915669587. The cubic root of 128257699 is about 504.3064019870.

The spelling of 128257699 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, six hundred ninety-nine".