686057919 has 8 divisors (see below), whose sum is σ = 934206720. Its totient is φ = 447640536.

The previous prime is 686057903. The next prime is 686057921. The reversal of 686057919 is 919750686.

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

It is not a de Polignac number, because 686057919 - 2⁴ = 686057903 is a prime.

It is a super-2 number, since 2×686057919² = 941350936445221122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686057989) 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 7 ways as a sum of consecutive naturals, for example, 2432689 + ... + 2432970.

It is an arithmetic number, because the mean of its divisors is an integer number (116775840).

Almost surely, 2^686057919 is an apocalyptic number.

686057919 is a deficient number, since it is larger than the sum of its proper divisors (248148801).

686057919 is a wasteful number, since it uses less digits than its factorization.

686057919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865709.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 686057919 is about 26192.7073629283. The cubic root of 686057919 is about 881.9695551011.

The spelling of 686057919 in words is "six hundred eighty-six million, fifty-seven thousand, nine hundred nineteen".