64544441 has 4 divisors (see below), whose sum is σ = 69509412. Its totient is φ = 59579472.

The previous prime is 64544423. The next prime is 64544443. The reversal of 64544441 is 14444546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33686416 + 30858025 = 5804^2 + 5555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64544441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64544398 and 64544407.

It is not an unprimeable number, because it can be changed into a prime (64544443) 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 3 ways as a sum of consecutive naturals, for example, 2482466 + ... + 2482491.

It is an arithmetic number, because the mean of its divisors is an integer number (17377353).

Almost surely, 2^64544441 is an apocalyptic number.

It is an amenable number.

64544441 is a deficient number, since it is larger than the sum of its proper divisors (4964971).

64544441 is a wasteful number, since it uses less digits than its factorization.

64544441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964970.

The product of its digits is 30720, while the sum is 32.

The square root of 64544441 is about 8033.9555014949. The cubic root of 64544441 is about 401.1310508787.

Adding to 64544441 its reverse (14444546), we get a palindrome (78988987).

The spelling of 64544441 in words is "sixty-four million, five hundred forty-four thousand, four hundred forty-one".