128468269 has 4 divisors (see below), whose sum is σ = 136025244. Its totient is φ = 120911296.

The previous prime is 128468267. The next prime is 128468273. The reversal of 128468269 is 962864821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 962864821 = 5113 ⋅188317.

It can be written as a sum of positive squares in 2 ways, for example, as 112572100 + 15896169 = 10610^2 + 3987^2 .

It is a cyclic number.

It is not a de Polignac number, because 128468269 - 2¹ = 128468267 is a prime.

It is a super-2 number, since 2×128468269² = 33008192279712722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128468267) 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 3 ways as a sum of consecutive naturals, for example, 3778462 + ... + 3778495.

It is an arithmetic number, because the mean of its divisors is an integer number (34006311).

Almost surely, 2^128468269 is an apocalyptic number.

It is an amenable number.

128468269 is a deficient number, since it is larger than the sum of its proper divisors (7556975).

128468269 is an equidigital number, since it uses as much as digits as its factorization.

128468269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556974.

The product of its digits is 331776, while the sum is 46.

The square root of 128468269 is about 11334.3843679311. The cubic root of 128468269 is about 504.5822365985.

It can be divided in two parts, 12846 and 8269, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 128468269 in words is "one hundred twenty-eight million, four hundred sixty-eight thousand, two hundred sixty-nine".