6440330447 has 8 divisors (see below), whose sum is σ = 6466777152. Its totient is φ = 6413904000.

The previous prime is 6440330443. The next prime is 6440330503. The reversal of 6440330447 is 7440330446.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440330447 - 2² = 6440330443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440330443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135643 + ... + 1141299.

It is an arithmetic number, because the mean of its divisors is an integer number (808347144).

Almost surely, 2^6440330447 is an apocalyptic number.

6440330447 is a deficient number, since it is larger than the sum of its proper divisors (26446705).

6440330447 is a wasteful number, since it uses less digits than its factorization.

6440330447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129.

The product of its (nonzero) digits is 96768, while the sum is 35.

The square root of 6440330447 is about 80251.6694343488. The cubic root of 6440330447 is about 1860.5273148411.

Subtracting 6440330447 from its reverse (7440330446), we obtain a palindrome (999999999).

The spelling of 6440330447 in words is "six billion, four hundred forty million, three hundred thirty thousand, four hundred forty-seven".