64005641 has 4 divisors (see below), whose sum is σ = 73149312. Its totient is φ = 54861972.

The previous prime is 64005541. The next prime is 64005647. The reversal of 64005641 is 14650046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64005641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64005641.

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, 4571825 + ... + 4571838.

It is an arithmetic number, because the mean of its divisors is an integer number (18287328).

Almost surely, 2^64005641 is an apocalyptic number.

It is an amenable number.

64005641 is a deficient number, since it is larger than the sum of its proper divisors (9143671).

64005641 is an equidigital number, since it uses as much as digits as its factorization.

64005641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9143670.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 64005641 is about 8000.3525547316. The cubic root of 64005641 is about 400.0117517381.

Adding to 64005641 its reverse (14650046), we get a palindrome (78655687).

It can be divided in two parts, 64005 and 641, that added together give a palindrome (64646).

The spelling of 64005641 in words is "sixty-four million, five thousand, six hundred forty-one".