5678661 has 4 divisors (see below), whose sum is σ = 7571552. Its totient is φ = 3785772.

The previous prime is 5678641. The next prime is 5678669. The reversal of 5678661 is 1668765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5678661 - 2⁹ = 5678149 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent 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, 946441 + ... + 946446.

It is an arithmetic number, because the mean of its divisors is an integer number (1892888).

Almost surely, 2^5678661 is an apocalyptic number.

It is an amenable number.

5678661 is a deficient number, since it is larger than the sum of its proper divisors (1892891).

5678661 is a wasteful number, since it uses less digits than its factorization.

5678661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892890.

The product of its digits is 60480, while the sum is 39.

The square root of 5678661 is about 2382.9941250452. The cubic root of 5678661 is about 178.4084065864.

The spelling of 5678661 in words is "five million, six hundred seventy-eight thousand, six hundred sixty-one".