128320783 has 2 divisors, whose sum is σ = 128320784. Its totient is φ = 128320782.

The previous prime is 128320771. The next prime is 128320793. The reversal of 128320783 is 387023821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128320783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128320793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64160391 + 64160392.

It is an arithmetic number, because the mean of its divisors is an integer number (64160392).

Almost surely, 2^128320783 is an apocalyptic number.

128320783 is a deficient number, since it is larger than the sum of its proper divisors (1).

128320783 is an equidigital number, since it uses as much as digits as its factorization.

128320783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 128320783 is about 11327.8763676163. The cubic root of 128320783 is about 504.3890700603.

The spelling of 128320783 in words is "one hundred twenty-eight million, three hundred twenty thousand, seven hundred eighty-three".