128632269 has 4 divisors (see below), whose sum is σ = 171509696. Its totient is φ = 85754844.

The previous prime is 128632267. The next prime is 128632291. The reversal of 128632269 is 962236821.

It is a happy number.

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 not a de Polignac number, because 128632269 - 2¹ = 128632267 is a prime.

It is a super-2 number, since 2×128632269² = 33092521256176722, 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 (128632267) 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, 21438709 + ... + 21438714.

It is an arithmetic number, because the mean of its divisors is an integer number (42877424).

Almost surely, 2^128632269 is an apocalyptic number.

It is an amenable number.

128632269 is a deficient number, since it is larger than the sum of its proper divisors (42877427).

128632269 is an equidigital number, since it uses as much as digits as its factorization.

128632269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42877426.

The product of its digits is 62208, while the sum is 39.

The square root of 128632269 is about 11341.6166837008. The cubic root of 128632269 is about 504.7968584644.

The spelling of 128632269 in words is "one hundred twenty-eight million, six hundred thirty-two thousand, two hundred sixty-nine".