6720403820 has 96 divisors (see below), whose sum is σ = 15763292160. Its totient is φ = 2389927680.

The previous prime is 6720403801. The next prime is 6720403847. The reversal of 6720403820 is 283040276.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1795511 + ... + 1799249.

It is an arithmetic number, because the mean of its divisors is an integer number (164200960).

Almost surely, 2^6720403820 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 6720403820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7881646080).

6720403820 is an abundant number, since it is smaller than the sum of its proper divisors (9042888340).

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

6720403820 is a wasteful number, since it uses less digits than its factorization.

6720403820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015 (or 4013 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 6720403820 is about 81978.0691404720. The cubic root of 6720403820 is about 1887.1153909565.

The spelling of 6720403820 in words is "six billion, seven hundred twenty million, four hundred three thousand, eight hundred twenty".