3686778 has 12 divisors (see below), whose sum is σ = 7988058. Its totient is φ = 1228920.

The previous prime is 3686747. The next prime is 3686797. The reversal of 3686778 is 8776863.

It can be written as a sum of positive squares in only one way, i.e., 2712609 + 974169 = 1647^2 + 987^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102393 + ... + 102428.

Almost surely, 2^3686778 is an apocalyptic number.

3686778 is an abundant number, since it is smaller than the sum of its proper divisors (4301280).

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

3686778 is a wasteful number, since it uses less digits than its factorization.

3686778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204829 (or 204826 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 3686778 is about 1920.0984349767. The cubic root of 3686778 is about 154.4835813765.

The spelling of 3686778 in words is "three million, six hundred eighty-six thousand, seven hundred seventy-eight".