128807317 has 8 divisors (see below), whose sum is σ = 139556736. Its totient is φ = 118410432.

The previous prime is 128807311. The next prime is 128807321. The reversal of 128807317 is 713708821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128807317 - 2¹⁵ = 128774549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128807311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87373 + ... + 88834.

It is an arithmetic number, because the mean of its divisors is an integer number (17444592).

Almost surely, 2^128807317 is an apocalyptic number.

128807317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128807317 is a deficient number, since it is larger than the sum of its proper divisors (10749419).

128807317 is a wasteful number, since it uses less digits than its factorization.

128807317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176267.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 128807317 is about 11349.3311256655. The cubic root of 128807317 is about 505.0257373413.

The spelling of 128807317 in words is "one hundred twenty-eight million, eight hundred seven thousand, three hundred seventeen".