6440215288 has 32 divisors (see below), whose sum is σ = 13249656000. Its totient is φ = 2916321408.

The previous prime is 6440215277. The next prime is 6440215289. The reversal of 6440215288 is 8825120446.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440215288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440215289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578688 + ... + 589711.

It is an arithmetic number, because the mean of its divisors is an integer number (414051750).

Almost surely, 2^6440215288 is an apocalyptic number.

It is an amenable number.

6440215288 is an abundant number, since it is smaller than the sum of its proper divisors (6809440712).

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

6440215288 is a wasteful number, since it uses less digits than its factorization.

6440215288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168471 (or 1168467 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 6440215288 is about 80250.9519445097. The cubic root of 6440215288 is about 1860.5162254649.

The spelling of 6440215288 in words is "six billion, four hundred forty million, two hundred fifteen thousand, two hundred eighty-eight".