128628223 has 4 divisors (see below), whose sum is σ = 128845728. Its totient is φ = 128410720.

The previous prime is 128628221. The next prime is 128628281. The reversal of 128628223 is 322826821.

It is a happy number.

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 128628223 - 2¹ = 128628221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128628221) 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, 107863 + ... + 109048.

It is an arithmetic number, because the mean of its divisors is an integer number (32211432).

Almost surely, 2^128628223 is an apocalyptic number.

128628223 is a deficient number, since it is larger than the sum of its proper divisors (217505).

128628223 is an equidigital number, since it uses as much as digits as its factorization.

128628223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217504.

The product of its digits is 18432, while the sum is 34.

The square root of 128628223 is about 11341.4383126656. The cubic root of 128628223 is about 504.7915657813.

The spelling of 128628223 in words is "one hundred twenty-eight million, six hundred twenty-eight thousand, two hundred twenty-three".