128670823 has 2 divisors, whose sum is σ = 128670824. Its totient is φ = 128670822.

The previous prime is 128670781. The next prime is 128670847. The reversal of 128670823 is 328076821.

It is a strong prime.

It is an emirp because it is prime and its reverse (328076821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128670823 - 2¹⁷ = 128539751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128670023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64335411 + 64335412.

It is an arithmetic number, because the mean of its divisors is an integer number (64335412).

Almost surely, 2^128670823 is an apocalyptic number.

128670823 is a deficient number, since it is larger than the sum of its proper divisors (1).

128670823 is an equidigital number, since it uses as much as digits as its factorization.

128670823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 128670823 is about 11343.3162258662. The cubic root of 128670823 is about 504.8472864381.

The spelling of 128670823 in words is "one hundred twenty-eight million, six hundred seventy thousand, eight hundred twenty-three".