64005644 has 12 divisors (see below), whose sum is σ = 113165304. Its totient is φ = 31672704.

The previous prime is 64005541. The next prime is 64005647. The reversal of 64005644 is 44650046.

It is not an unprimeable number, because it can be changed into a prime (64005647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82094 + ... + 82869.

It is an arithmetic number, because the mean of its divisors is an integer number (9430442).

Almost surely, 2^64005644 is an apocalyptic number.

It is an amenable number.

64005644 is a deficient number, since it is larger than the sum of its proper divisors (49159660).

64005644 is a wasteful number, since it uses less digits than its factorization.

64005644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165064 (or 165062 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 64005644 is about 8000.3527422233. The cubic root of 64005644 is about 400.0117579877.

The spelling of 64005644 in words is "sixty-four million, five thousand, six hundred forty-four".