128727017 has 4 divisors (see below), whose sum is σ = 129261396. Its totient is φ = 128192640.

The previous prime is 128727013. The next prime is 128727023. The reversal of 128727017 is 710727821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710727821 = 71 ⋅10010251.

It can be written as a sum of positive squares in 2 ways, for example, as 74321641 + 54405376 = 8621^2 + 7376^2 .

It is a cyclic number.

It is not a de Polignac number, because 128727017 - 2² = 128727013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128727013) 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 in 3 ways as a sum of consecutive naturals, for example, 266828 + ... + 267309.

It is an arithmetic number, because the mean of its divisors is an integer number (32315349).

Almost surely, 2^128727017 is an apocalyptic number.

It is an amenable number.

128727017 is a deficient number, since it is larger than the sum of its proper divisors (534379).

128727017 is an equidigital number, since it uses as much as digits as its factorization.

128727017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534378.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 128727017 is about 11345.7929207262. The cubic root of 128727017 is about 504.9207691926.

The spelling of 128727017 in words is "one hundred twenty-eight million, seven hundred twenty-seven thousand, seventeen".