6499886688 has 96 divisors (see below), whose sum is σ = 19142323200. Its totient is φ = 2145564288.

The previous prime is 6499886651. The next prime is 6499886693. The reversal of 6499886688 is 8866889946.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52473 + ... + 125511.

It is an arithmetic number, because the mean of its divisors is an integer number (199399200).

Almost surely, 2^6499886688 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 6499886688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9571161600).

6499886688 is an abundant number, since it is smaller than the sum of its proper divisors (12642436512).

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

6499886688 is a wasteful number, since it uses less digits than its factorization.

6499886688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73161 (or 73147 counting only the distinct ones).

The product of its digits is 286654464, while the sum is 72.

The square root of 6499886688 is about 80621.8747487306. The cubic root of 6499886688 is about 1866.2447337737.

The spelling of 6499886688 in words is "six billion, four hundred ninety-nine million, eight hundred eighty-six thousand, six hundred eighty-eight".