8221656 has 16 divisors (see below), whose sum is σ = 20554200. Its totient is φ = 2740544.

The previous prime is 8221651. The next prime is 8221657. The reversal of 8221656 is 6561228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221651) 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, 171261 + ... + 171308.

Almost surely, 2^8221656 is an apocalyptic number.

It is an amenable number.

8221656 is an abundant number, since it is smaller than the sum of its proper divisors (12332544).

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

8221656 is a wasteful number, since it uses less digits than its factorization.

8221656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342578 (or 342574 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 8221656 is about 2867.3430209865. The cubic root of 8221656 is about 201.8303316648.

The spelling of 8221656 in words is "eight million, two hundred twenty-one thousand, six hundred fifty-six".