128634211 has 4 divisors (see below), whose sum is σ = 128693952. Its totient is φ = 128574472.

The previous prime is 128634203. The next prime is 128634217. The reversal of 128634211 is 112436821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128634211 - 2³ = 128634203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128634211.

It is not an unprimeable number, because it can be changed into a prime (128634217) 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, 26515 + ... + 30988.

It is an arithmetic number, because the mean of its divisors is an integer number (32173488).

Almost surely, 2^128634211 is an apocalyptic number.

128634211 is a deficient number, since it is larger than the sum of its proper divisors (59741).

128634211 is an equidigital number, since it uses as much as digits as its factorization.

128634211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59740.

The product of its digits is 2304, while the sum is 28.

The square root of 128634211 is about 11341.7022972744. The cubic root of 128634211 is about 504.7993988082.

The spelling of 128634211 in words is "one hundred twenty-eight million, six hundred thirty-four thousand, two hundred eleven".