128503017 has 28 divisors (see below), whose sum is σ = 204019380. Its totient is φ = 80621568.

The previous prime is 128503013. The next prime is 128503019. The reversal of 128503017 is 710305821.

It can be written as a sum of positive squares in 2 ways, for example, as 48149721 + 80353296 = 6939^2 + 8964^2 .

It is not a de Polignac number, because 128503017 - 2² = 128503013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128503013) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7209 + ... + 17577.

Almost surely, 2^128503017 is an apocalyptic number.

128503017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128503017 is a deficient number, since it is larger than the sum of its proper divisors (75516363).

128503017 is an equidigital number, since it uses as much as digits as its factorization.

128503017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404 (or 10389 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 128503017 is about 11335.9171221388. The cubic root of 128503017 is about 504.6277255045.

Adding to 128503017 its reverse (710305821), we get a palindrome (838808838).

The spelling of 128503017 in words is "one hundred twenty-eight million, five hundred three thousand, seventeen".