7722720 has 144 divisors (see below), whose sum is σ = 27361152. Its totient is φ = 1981440.

The previous prime is 7722707. The next prime is 7722731. The reversal of 7722720 is 272277.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 44554 + ... + 44726.

It is an arithmetic number, because the mean of its divisors is an integer number (190008).

Almost surely, 2^7722720 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 7722720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13680576).

7722720 is an abundant number, since it is smaller than the sum of its proper divisors (19638432).

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

7722720 is a wasteful number, since it uses less digits than its factorization.

7722720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 7722720 is about 2778.9782294937. The cubic root of 7722720 is about 197.6621111986.

Adding to 7722720 its reverse (272277), we get a palindrome (7994997).

The spelling of 7722720 in words is "seven million, seven hundred twenty-two thousand, seven hundred twenty".