2216656 has 20 divisors (see below), whose sum is σ = 4625572. Its totient is φ = 1022976.

The previous prime is 2216653. The next prime is 2216657. The reversal of 2216656 is 6566122.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 2005056 = 460^2 + 1416^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216653) 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, 5121 + ... + 5536.

2^2216656 is an apocalyptic number.

2216656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2216656 is an abundant number, since it is smaller than the sum of its proper divisors (2408916).

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

2216656 is a wasteful number, since it uses less digits than its factorization.

2216656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10678 (or 10672 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 2216656 is about 1488.8438467482. The cubic root of 2216656 is about 130.3865418256.

It can be divided in two parts, 22166 and 56, that added together give a palindrome (22222).

The spelling of 2216656 in words is "two million, two hundred sixteen thousand, six hundred fifty-six".