8220866 has 4 divisors (see below), whose sum is σ = 12331302. Its totient is φ = 4110432.

The previous prime is 8220853. The next prime is 8220881. The reversal of 8220866 is 6680228.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 2627641 = 2365^2 + 1621^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2055215 + ... + 2055218.

Almost surely, 2^8220866 is an apocalyptic number.

8220866 is a deficient number, since it is larger than the sum of its proper divisors (4110436).

8220866 is a wasteful number, since it uses less digits than its factorization.

8220866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110435.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 8220866 is about 2867.2052594818. The cubic root of 8220866 is about 201.8238669871.

The spelling of 8220866 in words is "eight million, two hundred twenty thousand, eight hundred sixty-six".