2643656 has 32 divisors (see below), whose sum is σ = 5184000. Its totient is φ = 1262976.

The previous prime is 2643647. The next prime is 2643659. The reversal of 2643656 is 6563462.

It is a super-3 number, since 3×2643656³ = 55428877449145333248, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29660 + ... + 29748.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2^2643656 is an apocalyptic number.

It is an amenable number.

2643656 is a deficient number, since it is larger than the sum of its proper divisors (2540344).

2643656 is a wasteful number, since it uses less digits than its factorization.

2643656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 217 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 2643656 is about 1625.9323479161. The cubic root of 2643656 is about 138.2722344330.

The spelling of 2643656 in words is "two million, six hundred forty-three thousand, six hundred fifty-six".