6721067820 has 96 divisors (see below), whose sum is σ = 19673031168. Its totient is φ = 1711232512.

The previous prime is 6721067813. The next prime is 6721067887. The reversal of 6721067820 is 287601276.

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, 805912 + ... + 814208.

It is an arithmetic number, because the mean of its divisors is an integer number (204927408).

Almost surely, 2^6721067820 is an apocalyptic number.

6721067820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6721067820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9836515584).

6721067820 is an abundant number, since it is smaller than the sum of its proper divisors (12951963348).

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

6721067820 is a wasteful number, since it uses less digits than its factorization.

6721067820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8919 (or 8917 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 6721067820 is about 81982.1189040635. The cubic root of 6721067820 is about 1887.1775401659.

The spelling of 6721067820 in words is "six billion, seven hundred twenty-one million, sixty-seven thousand, eight hundred twenty".