5686781 has 4 divisors (see below), whose sum is σ = 5691552. Its totient is φ = 5682012.

The previous prime is 5686777. The next prime is 5686783. The reversal of 5686781 is 1876865.

5686781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1876865 = 5 ⋅375373.

It is a cyclic number.

It is not a de Polignac number, because 5686781 - 2² = 5686777 is a prime.

It is a super-2 number, since 2×5686781² = 64678956283922, 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 (5686783) 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, 1136 + ... + 3558.

It is an arithmetic number, because the mean of its divisors is an integer number (1422888).

Almost surely, 2^5686781 is an apocalyptic number.

It is an amenable number.

5686781 is a deficient number, since it is larger than the sum of its proper divisors (4771).

5686781 is a wasteful number, since it uses less digits than its factorization.

5686781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770.

The product of its digits is 80640, while the sum is 41.

The square root of 5686781 is about 2384.6972554184. The cubic root of 5686781 is about 178.4934023459.

The spelling of 5686781 in words is "five million, six hundred eighty-six thousand, seven hundred eighty-one".