8722720 has 24 divisors (see below), whose sum is σ = 20607804. Its totient is φ = 3489024.

The previous prime is 8722711. The next prime is 8722739. The reversal of 8722720 is 272278.

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 266256 = 2908^2 + 516^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27099 + ... + 27418.

Almost surely, 2^8722720 is an apocalyptic number.

8722720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8722720 is an abundant number, since it is smaller than the sum of its proper divisors (11885084).

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

8722720 is a wasteful number, since it uses less digits than its factorization.

8722720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54532 (or 54524 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 8722720 is about 2953.4251302513. The cubic root of 8722720 is about 205.8498922172.

Adding to 8722720 its reverse (272278), we get a palindrome (8994998).

The spelling of 8722720 in words is "eight million, seven hundred twenty-two thousand, seven hundred twenty".