7221680 has 20 divisors (see below), whose sum is σ = 16790592. Its totient is φ = 2888640.

The previous prime is 7221661. The next prime is 7221689. The reversal of 7221680 is 861227.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7221689) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 45056 + ... + 45215.

Almost surely, 2^7221680 is an apocalyptic number.

It is an amenable number.

7221680 is an abundant number, since it is smaller than the sum of its proper divisors (9568912).

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

7221680 is a wasteful number, since it uses less digits than its factorization.

7221680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90284 (or 90278 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 7221680 is about 2687.3183659552. The cubic root of 7221680 is about 193.2914957693.

The spelling of 7221680 in words is "seven million, two hundred twenty-one thousand, six hundred eighty".