64400717 has 2 divisors, whose sum is σ = 64400718. Its totient is φ = 64400716.

The previous prime is 64400663. The next prime is 64400723. The reversal of 64400717 is 71700446.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42367081 + 22033636 = 6509^2 + 4694^2 .

It is a cyclic number.

It is not a de Polignac number, because 64400717 - 2¹⁰ = 64399693 is a prime.

It is a super-2 number, since 2×64400717² = 8294904700228178, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64400717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64400767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200358 + 32200359.

It is an arithmetic number, because the mean of its divisors is an integer number (32200359).

Almost surely, 2^64400717 is an apocalyptic number.

It is an amenable number.

64400717 is a deficient number, since it is larger than the sum of its proper divisors (1).

64400717 is an equidigital number, since it uses as much as digits as its factorization.

64400717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 64400717 is about 8025.0057320852. The cubic root of 64400717 is about 400.8330907781.

The spelling of 64400717 in words is "sixty-four million, four hundred thousand, seven hundred seventeen".