686467871 has 4 divisors (see below), whose sum is σ = 726848352. Its totient is φ = 646087392.

The previous prime is 686467843. The next prime is 686467877. The reversal of 686467871 is 178764686.

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

It is a cyclic number.

It is not a de Polignac number, because 686467871 - 2⁶ = 686467807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686467877) 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 3 ways as a sum of consecutive naturals, for example, 20190215 + ... + 20190248.

It is an arithmetic number, because the mean of its divisors is an integer number (181712088).

Almost surely, 2^686467871 is an apocalyptic number.

686467871 is a deficient number, since it is larger than the sum of its proper divisors (40380481).

686467871 is a wasteful number, since it uses less digits than its factorization.

686467871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40380480.

The product of its digits is 2709504, while the sum is 53.

The square root of 686467871 is about 26200.5318839141. The cubic root of 686467871 is about 882.1451929394.

The spelling of 686467871 in words is "six hundred eighty-six million, four hundred sixty-seven thousand, eight hundred seventy-one".