128508907 has 2 divisors, whose sum is σ = 128508908. Its totient is φ = 128508906.

The previous prime is 128508893. The next prime is 128508943. The reversal of 128508907 is 709805821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128508907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128508907.

It is not a weakly prime, because it can be changed into another prime (128508997) 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, 64254453 + 64254454.

It is an arithmetic number, because the mean of its divisors is an integer number (64254454).

Almost surely, 2^128508907 is an apocalyptic number.

128508907 is a deficient number, since it is larger than the sum of its proper divisors (1).

128508907 is an equidigital number, since it uses as much as digits as its factorization.

128508907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 128508907 is about 11336.1769128750. The cubic root of 128508907 is about 504.6354353413.

The spelling of 128508907 in words is "one hundred twenty-eight million, five hundred eight thousand, nine hundred seven".