64424809 has 2 divisors, whose sum is σ = 64424810. Its totient is φ = 64424808.

The previous prime is 64424797. The next prime is 64424819. The reversal of 64424809 is 90842446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58568409 + 5856400 = 7653^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 64424809 - 2¹⁷ = 64293737 is a prime.

It is not a weakly prime, because it can be changed into another prime (64424819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32212404 + 32212405.

It is an arithmetic number, because the mean of its divisors is an integer number (32212405).

Almost surely, 2^64424809 is an apocalyptic number.

It is an amenable number.

64424809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64424809 is an equidigital number, since it uses as much as digits as its factorization.

64424809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 64424809 is about 8026.5066498446. The cubic root of 64424809 is about 400.8830677935.

The spelling of 64424809 in words is "sixty-four million, four hundred twenty-four thousand, eight hundred nine".