64450609 has 2 divisors, whose sum is σ = 64450610. Its totient is φ = 64450608.

The previous prime is 64450601. The next prime is 64450637. The reversal of 64450609 is 90605446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32809984 + 31640625 = 5728^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 64450609 - 2³ = 64450601 is a prime.

It is not a weakly prime, because it can be changed into another prime (64450601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32225304 + 32225305.

It is an arithmetic number, because the mean of its divisors is an integer number (32225305).

Almost surely, 2^64450609 is an apocalyptic number.

It is an amenable number.

64450609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64450609 is an equidigital number, since it uses as much as digits as its factorization.

64450609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 64450609 is about 8028.1136638690. The cubic root of 64450609 is about 400.9365741108.

The spelling of 64450609 in words is "sixty-four million, four hundred fifty thousand, six hundred nine".