2656687 has 4 divisors (see below), whose sum is σ = 2898216. Its totient is φ = 2415160.

The previous prime is 2656681. The next prime is 2656699. The reversal of 2656687 is 7866562.

2656687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-2656687 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120748 + ... + 120769.

It is an arithmetic number, because the mean of its divisors is an integer number (724554).

2^2656687 is an apocalyptic number.

2656687 is a deficient number, since it is larger than the sum of its proper divisors (241529).

2656687 is a wasteful number, since it uses less digits than its factorization.

2656687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241528.

The product of its digits is 120960, while the sum is 40.

The square root of 2656687 is about 1629.9346612671. The cubic root of 2656687 is about 138.4990507653.

The spelling of 2656687 in words is "two million, six hundred fifty-six thousand, six hundred eighty-seven".