3220656 has 40 divisors (see below), whose sum is σ = 8384880. Its totient is φ = 1065216.

The previous prime is 3220639. The next prime is 3220661. The reversal of 3220656 is 6560223.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10846 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (209622).

Almost surely, 2^3220656 is an apocalyptic number.

It is an amenable number.

3220656 is an abundant number, since it is smaller than the sum of its proper divisors (5164224).

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

3220656 is a wasteful number, since it uses less digits than its factorization.

3220656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 3220656 is about 1794.6186224376. The cubic root of 3220656 is about 147.6776524588.

Adding to 3220656 its reverse (6560223), we get a palindrome (9780879).

The spelling of 3220656 in words is "three million, two hundred twenty thousand, six hundred fifty-six".