64443909 has 8 divisors (see below), whose sum is σ = 87753600. Its totient is φ = 42048416.

The previous prime is 64443901. The next prime is 64443913. The reversal of 64443909 is 90934446.

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 64443909 - 2³ = 64443901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64443901) 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, 228384 + ... + 228665.

It is an arithmetic number, because the mean of its divisors is an integer number (10969200).

Almost surely, 2^64443909 is an apocalyptic number.

It is an amenable number.

64443909 is a deficient number, since it is larger than the sum of its proper divisors (23309691).

64443909 is a wasteful number, since it uses less digits than its factorization.

64443909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457099.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 64443909 is about 8027.6963694450. The cubic root of 64443909 is about 400.9226804322.

The spelling of 64443909 in words is "sixty-four million, four hundred forty-three thousand, nine hundred nine".