64715993 has 2 divisors, whose sum is σ = 64715994. Its totient is φ = 64715992.

The previous prime is 64715947. The next prime is 64716011. The reversal of 64715993 is 39951746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 9168784 = 7453^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 64715993 - 2⁶ = 64715929 is a prime.

It is not a weakly prime, because it can be changed into another prime (64715933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32357996 + 32357997.

It is an arithmetic number, because the mean of its divisors is an integer number (32357997).

Almost surely, 2^64715993 is an apocalyptic number.

It is an amenable number.

64715993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64715993 is an equidigital number, since it uses as much as digits as its factorization.

64715993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 64715993 is about 8044.6251000280. The cubic root of 64715993 is about 401.4861238353.

The spelling of 64715993 in words is "sixty-four million, seven hundred fifteen thousand, nine hundred ninety-three".