6440046220 has 24 divisors (see below), whose sum is σ = 13811845824. Its totient is φ = 2521209216.

The previous prime is 6440046187. The next prime is 6440046227. The reversal of 6440046220 is 226400446.

It is not an unprimeable number, because it can be changed into a prime (6440046227) 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, 3424617 + ... + 3426496.

It is an arithmetic number, because the mean of its divisors is an integer number (575493576).

Almost surely, 2^6440046220 is an apocalyptic number.

It is an amenable number.

6440046220 is an abundant number, since it is smaller than the sum of its proper divisors (7371799604).

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

6440046220 is a wasteful number, since it uses less digits than its factorization.

6440046220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851169 (or 6851167 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 6440046220 is about 80249.8985669141. The cubic root of 6440046220 is about 1860.4999446163.

Adding to 6440046220 its reverse (226400446), we get a palindrome (6666446666).

The spelling of 6440046220 in words is "six billion, four hundred forty million, forty-six thousand, two hundred twenty".