2688656 has 20 divisors (see below), whose sum is σ = 5241852. Its totient is φ = 1335936.

The previous prime is 2688629. The next prime is 2688659. The reversal of 2688656 is 6568862.

It can be written as a sum of positive squares in 2 ways, for example, as 1478656 + 1210000 = 1216^2 + 1100^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2688659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2726 + ... + 3578.

2^2688656 is an apocalyptic number.

It is an amenable number.

2688656 is a deficient number, since it is larger than the sum of its proper divisors (2553196).

2688656 is a wasteful number, since it uses less digits than its factorization.

2688656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1052 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 2688656 is about 1639.7121698640. The cubic root of 2688656 is about 139.0523757558.

The spelling of 2688656 in words is "two million, six hundred eighty-eight thousand, six hundred fifty-six".