7220720 has 80 divisors (see below), whose sum is σ = 18561312. Its totient is φ = 2595840.

The previous prime is 7220713. The next prime is 7220729. The reversal of 7220720 is 270227.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 7220692 and 7220701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55055 + ... + 55185.

Almost surely, 2^7220720 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 7220720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9280656).

7220720 is an abundant number, since it is smaller than the sum of its proper divisors (11340592).

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

7220720 is a wasteful number, since it uses less digits than its factorization.

7220720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 7220720 is about 2687.1397432958. The cubic root of 7220720 is about 193.2829304466.

Adding to 7220720 its reverse (270227), we get a palindrome (7490947).

It can be divided in two parts, 72207 and 20, that added together give a palindrome (72227).

The spelling of 7220720 in words is "seven million, two hundred twenty thousand, seven hundred twenty".