128223679 has 2 divisors, whose sum is σ = 128223680. Its totient is φ = 128223678.

The previous prime is 128223653. The next prime is 128223701. The reversal of 128223679 is 976322821.

It is a strong prime.

It is an emirp because it is prime and its reverse (976322821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128223679 - 2¹⁵ = 128190911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128223619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64111839 + 64111840.

It is an arithmetic number, because the mean of its divisors is an integer number (64111840).

Almost surely, 2^128223679 is an apocalyptic number.

128223679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128223679 is an equidigital number, since it uses as much as digits as its factorization.

128223679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 128223679 is about 11323.5894927359. The cubic root of 128223679 is about 504.2618094179.

The spelling of 128223679 in words is "one hundred twenty-eight million, two hundred twenty-three thousand, six hundred seventy-nine".