64445609 has 8 divisors (see below), whose sum is σ = 67492032. Its totient is φ = 61419600.

The previous prime is 64445603. The next prime is 64445611. The reversal of 64445609 is 90654446.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64445609 - 2¹² = 64441513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64445603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559 + ... + 11459.

It is an arithmetic number, because the mean of its divisors is an integer number (8436504).

Almost surely, 2^64445609 is an apocalyptic number.

It is an amenable number.

64445609 is a deficient number, since it is larger than the sum of its proper divisors (3046423).

64445609 is a wasteful number, since it uses less digits than its factorization.

64445609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10207.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 64445609 is about 8027.8022521734. The cubic root of 64445609 is about 400.9262057851.

The spelling of 64445609 in words is "sixty-four million, four hundred forty-five thousand, six hundred nine".