64440269 has 2 divisors, whose sum is σ = 64440270. Its totient is φ = 64440268.

The previous prime is 64440263. The next prime is 64440281. The reversal of 64440269 is 96204446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46758244 + 17682025 = 6838^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 64440269 - 2⁴ = 64440253 is a prime.

It is a super-2 number, since 2×64440269² = 8305096537584722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64440263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220134 + 32220135.

It is an arithmetic number, because the mean of its divisors is an integer number (32220135).

Almost surely, 2^64440269 is an apocalyptic number.

It is an amenable number.

64440269 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440269 is an equidigital number, since it uses as much as digits as its factorization.

64440269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 64440269 is about 8027.4696511416. The cubic root of 64440269 is about 400.9151318211.

The spelling of 64440269 in words is "sixty-four million, four hundred forty thousand, two hundred sixty-nine".