6647781308 has 48 divisors (see below), whose sum is σ = 13698901440. Its totient is φ = 2763830784.

The previous prime is 6647781307. The next prime is 6647781311. The reversal of 6647781308 is 8031877466.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647781307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106910 + ... + 157242.

It is an arithmetic number, because the mean of its divisors is an integer number (285393780).

Almost surely, 2^6647781308 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 6647781308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6849450720).

6647781308 is an abundant number, since it is smaller than the sum of its proper divisors (7051120132).

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

6647781308 is a wasteful number, since it uses less digits than its factorization.

6647781308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50486 (or 50484 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 6647781308 is about 81533.9273431619. The cubic root of 6647781308 is about 1880.2931966893.

The spelling of 6647781308 in words is "six billion, six hundred forty-seven million, seven hundred eighty-one thousand, three hundred eight".