6720613 has 4 divisors (see below), whose sum is σ = 6782380. Its totient is φ = 6658848.

The previous prime is 6720607. The next prime is 6720617. The reversal of 6720613 is 3160276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4008004 + 2712609 = 2002^2 + 1647^2 .

It is a cyclic number.

It is not a de Polignac number, because 6720613 - 2¹³ = 6712421 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 (6720617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30720 + ... + 30937.

It is an arithmetic number, because the mean of its divisors is an integer number (1695595).

Almost surely, 2^6720613 is an apocalyptic number.

It is an amenable number.

6720613 is a deficient number, since it is larger than the sum of its proper divisors (61767).

6720613 is a wasteful number, since it uses less digits than its factorization.

6720613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61766.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 6720613 is about 2592.4145116088. The cubic root of 6720613 is about 188.7134970271.

Adding to 6720613 its reverse (3160276), we get a palindrome (9880889).

The spelling of 6720613 in words is "six million, seven hundred twenty thousand, six hundred thirteen".