128266269 has 4 divisors (see below), whose sum is σ = 171021696. Its totient is φ = 85510844.

The previous prime is 128266261. The next prime is 128266277. The reversal of 128266269 is 962662821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (128266261) and next prime (128266277).

It is a cyclic number.

It is not a de Polignac number, because 128266269 - 2³ = 128266261 is a prime.

It is a super-2 number, since 2×128266269² = 32904471526360722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128266269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128266261) 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, 21377709 + ... + 21377714.

It is an arithmetic number, because the mean of its divisors is an integer number (42755424).

Almost surely, 2^128266269 is an apocalyptic number.

It is an amenable number.

128266269 is a deficient number, since it is larger than the sum of its proper divisors (42755427).

128266269 is an equidigital number, since it uses as much as digits as its factorization.

128266269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42755426.

The product of its digits is 124416, while the sum is 42.

The square root of 128266269 is about 11325.4699240252. The cubic root of 128266269 is about 504.3176340862.

The spelling of 128266269 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, two hundred sixty-nine".