6720013 has 4 divisors (see below), whose sum is σ = 6863040. Its totient is φ = 6576988.

The previous prime is 6720011. The next prime is 6720047. The reversal of 6720013 is 3100276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6720013 - 2¹ = 6720011 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 (6720011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71443 + ... + 71536.

It is an arithmetic number, because the mean of its divisors is an integer number (1715760).

Almost surely, 2^6720013 is an apocalyptic number.

It is an amenable number.

6720013 is a deficient number, since it is larger than the sum of its proper divisors (143027).

6720013 is a wasteful number, since it uses less digits than its factorization.

6720013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143026.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 6720013 is about 2592.2987867914. The cubic root of 6720013 is about 188.7078808991.

Adding to 6720013 its reverse (3100276), we get a palindrome (9820289).

The spelling of 6720013 in words is "six million, seven hundred twenty thousand, thirteen".