686127771 has 48 divisors (see below), whose sum is σ = 1171632384. Its totient is φ = 378810432.

The previous prime is 686127749. The next prime is 686127773. The reversal of 686127771 is 177721686.

It is not a de Polignac number, because 686127771 - 2¹¹ = 686125723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686127773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 222180 + ... + 225246.

It is an arithmetic number, because the mean of its divisors is an integer number (24409008).

Almost surely, 2^686127771 is an apocalyptic number.

686127771 is a deficient number, since it is larger than the sum of its proper divisors (485504613).

686127771 is a wasteful number, since it uses less digits than its factorization.

686127771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200 (or 3197 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 686127771 is about 26194.0407535760. The cubic root of 686127771 is about 881.9994870961. Note that the first 3 decimals are identical.

The spelling of 686127771 in words is "six hundred eighty-six million, one hundred twenty-seven thousand, seven hundred seventy-one".