7221568 has 28 divisors (see below), whose sum is σ = 14607540. Its totient is φ = 3540992.

The previous prime is 7221547. The next prime is 7221569. The reversal of 7221568 is 8651227.

It can be written as a sum of positive squares in 2 ways, for example, as 3504384 + 3717184 = 1872^2 + 1928^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221569) 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, 2328 + ... + 4456.

Almost surely, 2^7221568 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 7221568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7303770).

7221568 is an abundant number, since it is smaller than the sum of its proper divisors (7385972).

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

7221568 is a wasteful number, since it uses less digits than its factorization.

7221568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2184 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 7221568 is about 2687.2975272567. The cubic root of 7221568 is about 193.2904965207.

It can be divided in two parts, 722 and 1568, that multiplied together give a square (1132096 = 1064²).

The spelling of 7221568 in words is "seven million, two hundred twenty-one thousand, five hundred sixty-eight".