7122720 has 192 divisors, whose sum is σ = 26127360. Its totient is φ = 1612800.

The previous prime is 7122697. The next prime is 7122721. The reversal of 7122720 is 272217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7122721) 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 31 ways as a sum of consecutive naturals, for example, 100285 + ... + 100355.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

Almost surely, 2^7122720 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 7122720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13063680).

7122720 is an abundant number, since it is smaller than the sum of its proper divisors (19004640).

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

7122720 is a wasteful number, since it uses less digits than its factorization.

7122720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 7122720 is about 2668.8424457056. The cubic root of 7122720 is about 192.4045290347.

Adding to 7122720 its reverse (272217), we get a palindrome (7394937).

It can be divided in two parts, 71 and 22720, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 7122720 in words is "seven million, one hundred twenty-two thousand, seven hundred twenty".