64393409 has 2 divisors, whose sum is σ = 64393410. Its totient is φ = 64393408.

The previous prime is 64393397. The next prime is 64393421. The reversal of 64393409 is 90439346.

It is a balanced prime because it is at equal distance from previous prime (64393397) and next prime (64393421).

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 20502784 = 6625^2 + 4528^2 .

It is a cyclic number.

It is not a de Polignac number, because 64393409 - 2¹² = 64389313 is a prime.

It is a super-2 number, since 2×64393409² = 8293022245282562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64393429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32196704 + 32196705.

It is an arithmetic number, because the mean of its divisors is an integer number (32196705).

Almost surely, 2^64393409 is an apocalyptic number.

It is an amenable number.

64393409 is a deficient number, since it is larger than the sum of its proper divisors (1).

64393409 is an equidigital number, since it uses as much as digits as its factorization.

64393409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 64393409 is about 8024.5503923896. The cubic root of 64393409 is about 400.8179284261.

The spelling of 64393409 in words is "sixty-four million, three hundred ninety-three thousand, four hundred nine".