64448509 has 2 divisors, whose sum is σ = 64448510. Its totient is φ = 64448508.

The previous prime is 64448497. The next prime is 64448521. The reversal of 64448509 is 90584446.

It is a balanced prime because it is at equal distance from previous prime (64448497) and next prime (64448521).

It can be written as a sum of positive squares in only one way, i.e., 56580484 + 7868025 = 7522^2 + 2805^2 .

It is a cyclic number.

It is not a de Polignac number, because 64448509 - 2¹⁹ = 63924221 is a prime.

It is a super-2 number, since 2×64448509² = 8307220624646162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64448569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32224254 + 32224255.

It is an arithmetic number, because the mean of its divisors is an integer number (32224255).

Almost surely, 2^64448509 is an apocalyptic number.

It is an amenable number.

64448509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64448509 is an equidigital number, since it uses as much as digits as its factorization.

64448509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 64448509 is about 8027.9828724282. The cubic root of 64448509 is about 400.9322194793.

The spelling of 64448509 in words is "sixty-four million, four hundred forty-eight thousand, five hundred nine".