64730221 has 2 divisors, whose sum is σ = 64730222. Its totient is φ = 64730220.

The previous prime is 64730209. The next prime is 64730231. The reversal of 64730221 is 12203746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 30085225 = 5886^2 + 5485^2 .

It is a cyclic number.

It is not a de Polignac number, because 64730221 - 2¹³ = 64722029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64730231) 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, 32365110 + 32365111.

It is an arithmetic number, because the mean of its divisors is an integer number (32365111).

Almost surely, 2^64730221 is an apocalyptic number.

It is an amenable number.

64730221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64730221 is an equidigital number, since it uses as much as digits as its factorization.

64730221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 64730221 is about 8045.5093685857. The cubic root of 64730221 is about 401.5155443115.

Adding to 64730221 its reverse (12203746), we get a palindrome (76933967).

The spelling of 64730221 in words is "sixty-four million, seven hundred thirty thousand, two hundred twenty-one".