686256771 has 8 divisors (see below), whose sum is σ = 930009424. Its totient is φ = 450004320.

The previous prime is 686256751. The next prime is 686256787. The reversal of 686256771 is 177652686.

686256771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686256771 - 2¹⁰ = 686255747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686256771.

It is not an unprimeable number, because it can be changed into a prime (686256751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874836 + ... + 1875201.

It is an arithmetic number, because the mean of its divisors is an integer number (116251178).

Almost surely, 2^686256771 is an apocalyptic number.

686256771 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

686256771 is a deficient number, since it is larger than the sum of its proper divisors (243752653).

686256771 is a wasteful number, since it uses less digits than its factorization.

686256771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750101.

The product of its digits is 846720, while the sum is 48.

The square root of 686256771 is about 26196.5030299847. The cubic root of 686256771 is about 882.0547590192.

The spelling of 686256771 in words is "six hundred eighty-six million, two hundred fifty-six thousand, seven hundred seventy-one".