6718720840 has 128 divisors (see below), whose sum is σ = 16795537920. Its totient is φ = 2403072000.

The previous prime is 6718720823. The next prime is 6718720847. The reversal of 6718720840 is 480278176.

It is not an unprimeable number, because it can be changed into a prime (6718720847) 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, 3218277 + ... + 3220363.

It is an arithmetic number, because the mean of its divisors is an integer number (131215140).

Almost surely, 2^6718720840 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 6718720840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8397768960).

6718720840 is an abundant number, since it is smaller than the sum of its proper divisors (10076817080).

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

6718720840 is a wasteful number, since it uses less digits than its factorization.

6718720840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303 (or 2299 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 6718720840 is about 81967.8036792496. The cubic root of 6718720840 is about 1886.9578487065.

The spelling of 6718720840 in words is "six billion, seven hundred eighteen million, seven hundred twenty thousand, eight hundred forty".