64320444 has 18 divisors (see below), whose sum is σ = 162587880. Its totient is φ = 21440136.

The previous prime is 64320439. The next prime is 64320449. The reversal of 64320444 is 44402346.

It is an interprime number because it is at equal distance from previous prime (64320439) and next prime (64320449).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64320449) 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 in 5 ways as a sum of consecutive naturals, for example, 893304 + ... + 893375.

It is an arithmetic number, because the mean of its divisors is an integer number (9032660).

Almost surely, 2^64320444 is an apocalyptic number.

It is an amenable number.

64320444 is an abundant number, since it is smaller than the sum of its proper divisors (98267436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64320444 is a wasteful number, since it uses less digits than its factorization.

64320444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786689 (or 1786684 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 64320444 is about 8020.0027431417. The cubic root of 64320444 is about 400.6664805591. Note that the first 3 decimals are identical.

The spelling of 64320444 in words is "sixty-four million, three hundred twenty thousand, four hundred forty-four".