64347641 has 4 divisors (see below), whose sum is σ = 64461300. Its totient is φ = 64233984.

The previous prime is 64347631. The next prime is 64347677. The reversal of 64347641 is 14674346.

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 19404025 + 44943616 = 4405^2 + 6704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64347641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64347631) 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 3 ways as a sum of consecutive naturals, for example, 55976 + ... + 57113.

It is an arithmetic number, because the mean of its divisors is an integer number (16115325).

Almost surely, 2^64347641 is an apocalyptic number.

It is an amenable number.

64347641 is a deficient number, since it is larger than the sum of its proper divisors (113659).

64347641 is a wasteful number, since it uses less digits than its factorization.

64347641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113658.

The product of its digits is 48384, while the sum is 35.

The square root of 64347641 is about 8021.6981369284. The cubic root of 64347641 is about 400.7229446737.

It can be divided in two parts, 643 and 47641, that added together give a palindrome (48284).

The spelling of 64347641 in words is "sixty-four million, three hundred forty-seven thousand, six hundred forty-one".