7221008 has 10 divisors (see below), whose sum is σ = 13990734. Its totient is φ = 3610496.

The previous prime is 7220999. The next prime is 7221013. The reversal of 7221008 is 8001227.

It can be written as a sum of positive squares in only one way, i.e., 3952144 + 3268864 = 1988^2 + 1808^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 225641 + ... + 225672.

Almost surely, 2^7221008 is an apocalyptic number.

It is an amenable number.

7221008 is a deficient number, since it is larger than the sum of its proper divisors (6769726).

7221008 is a wasteful number, since it uses less digits than its factorization.

7221008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451321 (or 451315 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 7221008 is about 2687.1933313403. The cubic root of 7221008 is about 193.2855001231.

The spelling of 7221008 in words is "seven million, two hundred twenty-one thousand, eight".