64867321 has 2 divisors, whose sum is σ = 64867322. Its totient is φ = 64867320.

The previous prime is 64867307. The next prime is 64867331. The reversal of 64867321 is 12376846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58293225 + 6574096 = 7635^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 64867321 - 2¹⁹ = 64343033 is a prime.

It is not a weakly prime, because it can be changed into another prime (64867301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433660 + 32433661.

It is an arithmetic number, because the mean of its divisors is an integer number (32433661).

Almost surely, 2^64867321 is an apocalyptic number.

It is an amenable number.

64867321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64867321 is an equidigital number, since it uses as much as digits as its factorization.

64867321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 64867321 is about 8054.0251427469. The cubic root of 64867321 is about 401.7988172651.

The spelling of 64867321 in words is "sixty-four million, eight hundred sixty-seven thousand, three hundred twenty-one".