2666856 has 16 divisors (see below), whose sum is σ = 6667200. Its totient is φ = 888944.

The previous prime is 2666819. The next prime is 2666861. The reversal of 2666856 is 6586662.

It is a super-2 number, since 2×2666856² = 14224241849472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55536 + ... + 55583.

It is an arithmetic number, because the mean of its divisors is an integer number (416700).

2^2666856 is an apocalyptic number.

It is an amenable number.

2666856 is an abundant number, since it is smaller than the sum of its proper divisors (4000344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2666856 is a wasteful number, since it uses less digits than its factorization.

2666856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111128 (or 111124 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 2666856 is about 1633.0511320837. The cubic root of 2666856 is about 138.6755367025.

Adding to 2666856 its sum of digits (39), we get a triangular number (2666895 = T₂₃₀₉).

The spelling of 2666856 in words is "two million, six hundred sixty-six thousand, eight hundred fifty-six".