64443839 has 8 divisors (see below), whose sum is σ = 68131440. Its totient is φ = 60785856.

The previous prime is 64443817. The next prime is 64443851. The reversal of 64443839 is 93834446.

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 64443839 - 2¹² = 64439743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64443796 and 64443805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64443809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852 + ... + 11705.

It is an arithmetic number, because the mean of its divisors is an integer number (8516430).

Almost surely, 2^64443839 is an apocalyptic number.

64443839 is a deficient number, since it is larger than the sum of its proper divisors (3687601).

64443839 is a wasteful number, since it uses less digits than its factorization.

64443839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14809.

The product of its digits is 248832, while the sum is 41.

The square root of 64443839 is about 8027.6920095380. The cubic root of 64443839 is about 400.9225352693.

The spelling of 64443839 in words is "sixty-four million, four hundred forty-three thousand, eight hundred thirty-nine".