128517207 has 32 divisors (see below), whose sum is σ = 211599360. Its totient is φ = 67564800.

The previous prime is 128517203. The next prime is 128517251. The reversal of 128517207 is 702715821.

It is not a de Polignac number, because 128517207 - 2² = 128517203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128517203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111082 + ... + 112232.

It is an arithmetic number, because the mean of its divisors is an integer number (6612480).

Almost surely, 2^128517207 is an apocalyptic number.

128517207 is a deficient number, since it is larger than the sum of its proper divisors (83082153).

128517207 is a wasteful number, since it uses less digits than its factorization.

128517207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 128517207 is about 11336.5429915826. The cubic root of 128517207 is about 504.6462993975.

The spelling of 128517207 in words is "one hundred twenty-eight million, five hundred seventeen thousand, two hundred seven".