6720320 has 28 divisors (see below), whose sum is σ = 16003524. Its totient is φ = 2688000.

The previous prime is 6720299. The next prime is 6720323. The reversal of 6720320 is 230276.

It can be written as a sum of positive squares in 2 ways, for example, as 1915456 + 4804864 = 1384^2 + 2192^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 6720292 and 6720301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720323) 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, 10181 + ... + 10820.

Almost surely, 2^6720320 is an apocalyptic number.

It is an amenable number.

6720320 is an abundant number, since it is smaller than the sum of its proper divisors (9283204).

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

6720320 is a wasteful number, since it uses less digits than its factorization.

6720320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21018 (or 21008 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 6720320 is about 2592.3579999684. The cubic root of 6720320 is about 188.7107545264.

Adding to 6720320 its reverse (230276), we get a palindrome (6950596).

The spelling of 6720320 in words is "six million, seven hundred twenty thousand, three hundred twenty".