128673823 has 2 divisors, whose sum is σ = 128673824. Its totient is φ = 128673822.

The previous prime is 128673793. The next prime is 128673851. The reversal of 128673823 is 328376821.

It is a strong prime.

It is an emirp because it is prime and its reverse (328376821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128673823 - 2⁵ = 128673791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128673893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64336911 + 64336912.

It is an arithmetic number, because the mean of its divisors is an integer number (64336912).

Almost surely, 2^128673823 is an apocalyptic number.

128673823 is a deficient number, since it is larger than the sum of its proper divisors (1).

128673823 is an equidigital number, since it uses as much as digits as its factorization.

128673823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 128673823 is about 11343.4484615570. The cubic root of 128673823 is about 504.8512099644.

The spelling of 128673823 in words is "one hundred twenty-eight million, six hundred seventy-three thousand, eight hundred twenty-three".