6440503312 has 20 divisors (see below), whose sum is σ = 13212503676. Its totient is φ = 3030824960.

The previous prime is 6440503297. The next prime is 6440503319. The reversal of 6440503312 is 2133050446.

It can be written as a sum of positive squares in 2 ways, for example, as 5305082896 + 1135420416 = 72836^2 + 33696^2 .

It is not an unprimeable number, because it can be changed into a prime (6440503319) 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, 11838889 + ... + 11839432.

Almost surely, 2^6440503312 is an apocalyptic number.

It is an amenable number.

6440503312 is an abundant number, since it is smaller than the sum of its proper divisors (6772000364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440503312 is a wasteful number, since it uses less digits than its factorization.

6440503312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23678346 (or 23678340 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6440503312 is about 80252.7464452152. The cubic root of 6440503312 is about 1860.5439608388.

Adding to 6440503312 its reverse (2133050446), we get a palindrome (8573553758).

The spelling of 6440503312 in words is "six billion, four hundred forty million, five hundred three thousand, three hundred twelve".