6499878216 has 64 divisors (see below), whose sum is σ = 17591454720. Its totient is φ = 1989473280.

The previous prime is 6499878211. The next prime is 6499878227. The reversal of 6499878216 is 6128789946.

It is a self number, because there is not a number n which added to its sum of digits gives 6499878216.

It is not an unprimeable number, because it can be changed into a prime (6499878211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5056 + ... + 114128.

It is an arithmetic number, because the mean of its divisors is an integer number (274866480).

Almost surely, 2^6499878216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6499878216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8795727360).

6499878216 is an abundant number, since it is smaller than the sum of its proper divisors (11091576504).

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

6499878216 is a wasteful number, since it uses less digits than its factorization.

6499878216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109286 (or 109282 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The square root of 6499878216 is about 80621.8222071419. The cubic root of 6499878216 is about 1866.2439229477.

The spelling of 6499878216 in words is "six billion, four hundred ninety-nine million, eight hundred seventy-eight thousand, two hundred sixteen".