7221808 has 40 divisors (see below), whose sum is σ = 15690960. Its totient is φ = 3191040.

The previous prime is 7221779. The next prime is 7221811. The reversal of 7221808 is 8081227.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5958 + ... + 7066.

It is an arithmetic number, because the mean of its divisors is an integer number (392274).

Almost surely, 2^7221808 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 7221808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7845480).

7221808 is an abundant number, since it is smaller than the sum of its proper divisors (8469152).

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

7221808 is a wasteful number, since it uses less digits than its factorization.

7221808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 7221808 is about 2687.3421814127. The cubic root of 7221808 is about 193.2926377549.

The spelling of 7221808 in words is "seven million, two hundred twenty-one thousand, eight hundred eight".