64718393 has 2 divisors, whose sum is σ = 64718394. Its totient is φ = 64718392.

The previous prime is 64718347. The next prime is 64718429. The reversal of 64718393 is 39381746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58553104 + 6165289 = 7652^2 + 2483^2 .

It is a cyclic number.

It is not a de Polignac number, because 64718393 - 2¹⁰ = 64717369 is a prime.

It is a super-3 number, since 3×64718393³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64718393.

It is not a weakly prime, because it can be changed into another prime (64718333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32359196 + 32359197.

It is an arithmetic number, because the mean of its divisors is an integer number (32359197).

Almost surely, 2^64718393 is an apocalyptic number.

It is an amenable number.

64718393 is a deficient number, since it is larger than the sum of its proper divisors (1).

64718393 is an equidigital number, since it uses as much as digits as its factorization.

64718393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 64718393 is about 8044.7742665658. The cubic root of 64718393 is about 401.4910868269.

The spelling of 64718393 in words is "sixty-four million, seven hundred eighteen thousand, three hundred ninety-three".