6440243332 has 12 divisors (see below), whose sum is σ = 11320076880. Its totient is φ = 3205935656.

The previous prime is 6440243321. The next prime is 6440243339. The reversal of 6440243332 is 2333420446.

It is a junction number, because it is equal to n+sod(n) for n = 6440243294 and 6440243303.

It is not an unprimeable number, because it can be changed into a prime (6440243339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545482 + ... + 3547297.

It is an arithmetic number, because the mean of its divisors is an integer number (943339740).

Almost surely, 2^6440243332 is an apocalyptic number.

It is an amenable number.

6440243332 is a deficient number, since it is larger than the sum of its proper divisors (4879833548).

6440243332 is a wasteful number, since it uses less digits than its factorization.

6440243332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7093010 (or 7093008 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 31.

The square root of 6440243332 is about 80251.1266712188. The cubic root of 6440243332 is about 1860.5189260082.

Adding to 6440243332 its reverse (2333420446), we get a palindrome (8773663778).

The spelling of 6440243332 in words is "six billion, four hundred forty million, two hundred forty-three thousand, three hundred thirty-two".