128784823 has 2 divisors, whose sum is σ = 128784824. Its totient is φ = 128784822.

The previous prime is 128784811. The next prime is 128784883. The reversal of 128784823 is 328487821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128784823 - 2⁹ = 128784311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128784823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128784883) 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, 64392411 + 64392412.

It is an arithmetic number, because the mean of its divisors is an integer number (64392412).

Almost surely, 2^128784823 is an apocalyptic number.

128784823 is a deficient number, since it is larger than the sum of its proper divisors (1).

128784823 is an equidigital number, since it uses as much as digits as its factorization.

128784823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 43.

The square root of 128784823 is about 11348.3400988867. The cubic root of 128784823 is about 504.9963375874.

The spelling of 128784823 in words is "one hundred twenty-eight million, seven hundred eighty-four thousand, eight hundred twenty-three".