6691789782 has 64 divisors (see below), whose sum is σ = 15206400000. Its totient is φ = 2180355840.

The previous prime is 6691789751. The next prime is 6691789787. The reversal of 6691789782 is 2879871966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691789787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3168907 + ... + 3171017.

It is an arithmetic number, because the mean of its divisors is an integer number (237600000).

Almost surely, 2^6691789782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6691789782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7603200000).

6691789782 is an abundant number, since it is smaller than the sum of its proper divisors (8514610218).

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

6691789782 is a wasteful number, since it uses less digits than its factorization.

6691789782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3412 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The square root of 6691789782 is about 81803.3604566463. The cubic root of 6691789782 is about 1884.4332698597.

The spelling of 6691789782 in words is "six billion, six hundred ninety-one million, seven hundred eighty-nine thousand, seven hundred eighty-two".