6720244405 has 24 divisors (see below), whose sum is σ = 9389061432. Its totient is φ = 4604164992.

The previous prime is 6720244309. The next prime is 6720244409. The reversal of 6720244405 is 5044420276.

It can be written as a sum of positive squares in 4 ways, for example, as 15876 + 6720228529 = 126^2 + 81977^2 .

It is not a de Polignac number, because 6720244405 - 2¹³ = 6720236213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720244409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285879 + ... + 308491.

It is an arithmetic number, because the mean of its divisors is an integer number (391210893).

Almost surely, 2^6720244405 is an apocalyptic number.

It is an amenable number.

6720244405 is a deficient number, since it is larger than the sum of its proper divisors (2668817027).

6720244405 is a wasteful number, since it uses less digits than its factorization.

6720244405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23845 (or 23838 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 6720244405 is about 81977.0968319811. The cubic root of 6720244405 is about 1887.1004693889.

The spelling of 6720244405 in words is "six billion, seven hundred twenty million, two hundred forty-four thousand, four hundred five".