65780389 has 2 divisors, whose sum is σ = 65780390. Its totient is φ = 65780388.

The previous prime is 65780369. The next prime is 65780423. The reversal of 65780389 is 98308756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 736164 = 8065^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 65780389 - 2⁹ = 65779877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65780329) 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, 32890194 + 32890195.

It is an arithmetic number, because the mean of its divisors is an integer number (32890195).

Almost surely, 2^65780389 is an apocalyptic number.

It is an amenable number.

65780389 is a deficient number, since it is larger than the sum of its proper divisors (1).

65780389 is an equidigital number, since it uses as much as digits as its factorization.

65780389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 65780389 is about 8110.5110196584. The cubic root of 65780389 is about 403.6752712773.

The spelling of 65780389 in words is "sixty-five million, seven hundred eighty thousand, three hundred eighty-nine".