2556688 has 10 divisors (see below), whose sum is σ = 4953614. Its totient is φ = 1278336.

The previous prime is 2556683. The next prime is 2556689. The reversal of 2556688 is 8866552.

It can be written as a sum of positive squares in only one way, i.e., 1364224 + 1192464 = 1168^2 + 1092^2 .

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 2556688.

It is not an unprimeable number, because it can be changed into a prime (2556683) 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 as a sum of consecutive naturals, namely, 79881 + ... + 79912.

2^2556688 is an apocalyptic number.

It is an amenable number.

2556688 is a deficient number, since it is larger than the sum of its proper divisors (2396926).

2556688 is a wasteful number, since it uses less digits than its factorization.

2556688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159801 (or 159795 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 2556688 is about 1598.9646650255. The cubic root of 2556688 is about 136.7390561044.

The spelling of 2556688 in words is "two million, five hundred fifty-six thousand, six hundred eighty-eight".