65730409 has 2 divisors, whose sum is σ = 65730410. Its totient is φ = 65730408.

The previous prime is 65730407. The next prime is 65730437. The reversal of 65730409 is 90403756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 120409 = 8100^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 65730409 - 2¹ = 65730407 is a prime.

Together with 65730407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65730403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32865204 + 32865205.

It is an arithmetic number, because the mean of its divisors is an integer number (32865205).

Almost surely, 2^65730409 is an apocalyptic number.

It is an amenable number.

65730409 is a deficient number, since it is larger than the sum of its proper divisors (1).

65730409 is an equidigital number, since it uses as much as digits as its factorization.

65730409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 65730409 is about 8107.4292473015. The cubic root of 65730409 is about 403.5730077589.

The spelling of 65730409 in words is "sixty-five million, seven hundred thirty thousand, four hundred nine".