2556687 has 16 divisors (see below), whose sum is σ = 3921152. Its totient is φ = 1451520.

The previous prime is 2556683. The next prime is 2556689. The reversal of 2556687 is 7866552.

It is a happy number.

It is not a de Polignac number, because 2556687 - 2² = 2556683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4143 + ... + 4719.

It is an arithmetic number, because the mean of its divisors is an integer number (245072).

2^2556687 is an apocalyptic number.

2556687 is a deficient number, since it is larger than the sum of its proper divisors (1364465).

2556687 is a wasteful number, since it uses less digits than its factorization.

2556687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its digits is 100800, while the sum is 39.

The square root of 2556687 is about 1598.9643523231. The cubic root of 2556687 is about 136.7390382768.

The spelling of 2556687 in words is "two million, five hundred fifty-six thousand, six hundred eighty-seven".