128674717 has 4 divisors (see below), whose sum is σ = 136243836. Its totient is φ = 121105600.

The previous prime is 128674709. The next prime is 128674727. The reversal of 128674717 is 717476821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118504996 + 10169721 = 10886^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 128674717 - 2³ = 128674709 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 (128674727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3784534 + ... + 3784567.

It is an arithmetic number, because the mean of its divisors is an integer number (34060959).

Almost surely, 2^128674717 is an apocalyptic number.

128674717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128674717 is a deficient number, since it is larger than the sum of its proper divisors (7569119).

128674717 is an equidigital number, since it uses as much as digits as its factorization.

128674717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7569118.

The product of its digits is 131712, while the sum is 43.

The square root of 128674717 is about 11343.4878674947. The cubic root of 128674717 is about 504.8523791634.

The spelling of 128674717 in words is "one hundred twenty-eight million, six hundred seventy-four thousand, seven hundred seventeen".