7221648 has 40 divisors (see below), whose sum is σ = 21322048. Its totient is φ = 2063232.

The previous prime is 7221631. The next prime is 7221649. The reversal of 7221648 is 8461227.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (7221649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10411 + ... + 11082.

Almost surely, 2^7221648 is an apocalyptic number.

It is an amenable number.

7221648 is an abundant number, since it is smaller than the sum of its proper divisors (14100400).

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

7221648 is a wasteful number, since it uses less digits than its factorization.

7221648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21511 (or 21505 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 7221648 is about 2687.3124120578. The cubic root of 7221648 is about 193.2912102707.

The spelling of 7221648 in words is "seven million, two hundred twenty-one thousand, six hundred forty-eight".