6720399808 has 56 divisors (see below), whose sum is σ = 14092001280. Its totient is φ = 3173364480.

The previous prime is 6720399797. The next prime is 6720399811. The reversal of 6720399808 is 8089930276.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87393 + ... + 145183.

It is an arithmetic number, because the mean of its divisors is an integer number (251642880).

Almost surely, 2^6720399808 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 6720399808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7046000640).

6720399808 is an abundant number, since it is smaller than the sum of its proper divisors (7371601472).

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

6720399808 is a wasteful number, since it uses less digits than its factorization.

6720399808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57905 (or 57895 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 6720399808 is about 81978.0446705092. The cubic root of 6720399808 is about 1887.1150154280.

The spelling of 6720399808 in words is "six billion, seven hundred twenty million, three hundred ninety-nine thousand, eight hundred eight".