5678665 has 4 divisors (see below), whose sum is σ = 6814404. Its totient is φ = 4542928.

The previous prime is 5678641. The next prime is 5678669. The reversal of 5678665 is 5668765.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 2424249 = 1804^2 + 1557^2 .

It is a cyclic number.

It is not a de Polignac number, because 5678665 - 2¹¹ = 5676617 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5678669) 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, 567862 + ... + 567871.

It is an arithmetic number, because the mean of its divisors is an integer number (1703601).

Almost surely, 2^5678665 is an apocalyptic number.

It is an amenable number.

5678665 is a deficient number, since it is larger than the sum of its proper divisors (1135739).

5678665 is a wasteful number, since it uses less digits than its factorization.

5678665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135738.

The product of its digits is 302400, while the sum is 43.

The square root of 5678665 is about 2382.9949643254. The cubic root of 5678665 is about 178.4084484761.

The spelling of 5678665 in words is "five million, six hundred seventy-eight thousand, six hundred sixty-five".