320778433 has 2 divisors, whose sum is σ = 320778434. Its totient is φ = 320778432.

The previous prime is 320778413. The next prime is 320778529. The reversal of 320778433 is 334877023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 300779649 + 19998784 = 17343^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 320778433 - 2⁹ = 320777921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320778392 and 320778401.

It is not a weakly prime, because it can be changed into another prime (320778413) 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, 160389216 + 160389217.

It is an arithmetic number, because the mean of its divisors is an integer number (160389217).

Almost surely, 2^320778433 is an apocalyptic number.

It is an amenable number.

320778433 is a deficient number, since it is larger than the sum of its proper divisors (1).

320778433 is an equidigital number, since it uses as much as digits as its factorization.

320778433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 320778433 is about 17910.2884678053. The cubic root of 320778433 is about 684.5445552603.

The spelling of 320778433 in words is "three hundred twenty million, seven hundred seventy-eight thousand, four hundred thirty-three".