2666687 has 4 divisors (see below), whose sum is σ = 2690400. Its totient is φ = 2642976.

The previous prime is 2666683. The next prime is 2666693. The reversal of 2666687 is 7866662.

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

It is a cyclic number.

It is not a de Polignac number, because 2666687 - 2² = 2666683 is a prime.

It is a super-2 number, since 2×2666687² = 14222439111938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11687 + ... + 11912.

It is an arithmetic number, because the mean of its divisors is an integer number (672600).

2^2666687 is an apocalyptic number.

2666687 is a deficient number, since it is larger than the sum of its proper divisors (23713).

2666687 is a wasteful number, since it uses less digits than its factorization.

2666687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23712.

The product of its digits is 145152, while the sum is 41.

The square root of 2666687 is about 1632.9993876300. Note that the first 3 decimals coincide. The cubic root of 2666687 is about 138.6726073279.

The spelling of 2666687 in words is "two million, six hundred sixty-six thousand, six hundred eighty-seven".