6720743920 has 80 divisors (see below), whose sum is σ = 17065880928. Its totient is φ = 2441093120.

The previous prime is 6720743893. The next prime is 6720743987. The reversal of 6720743920 is 293470276.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855852 + ... + 863668.

Almost surely, 2^6720743920 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 6720743920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8532940464).

6720743920 is an abundant number, since it is smaller than the sum of its proper divisors (10345137008).

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

6720743920 is a wasteful number, since it uses less digits than its factorization.

6720743920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8818 (or 8812 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 6720743920 is about 81980.1434494964. The cubic root of 6720743920 is about 1887.1472242180.

The spelling of 6720743920 in words is "six billion, seven hundred twenty million, seven hundred forty-three thousand, nine hundred twenty".