64740217 has 2 divisors, whose sum is σ = 64740218. Its totient is φ = 64740216.

The previous prime is 64740211. The next prime is 64740229. The reversal of 64740217 is 71204746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57320041 + 7420176 = 7571^2 + 2724^2 .

It is a cyclic number.

It is not a de Polignac number, because 64740217 - 2¹⁵ = 64707449 is a prime.

It is not a weakly prime, because it can be changed into another prime (64740211) 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, 32370108 + 32370109.

It is an arithmetic number, because the mean of its divisors is an integer number (32370109).

Almost surely, 2^64740217 is an apocalyptic number.

It is an amenable number.

64740217 is a deficient number, since it is larger than the sum of its proper divisors (1).

64740217 is an equidigital number, since it uses as much as digits as its factorization.

64740217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 64740217 is about 8046.1305607105. The cubic root of 64740217 is about 401.5362113340.

The spelling of 64740217 in words is "sixty-four million, seven hundred forty thousand, two hundred seventeen".