686240057 has 8 divisors (see below), whose sum is σ = 706323840. Its totient is φ = 666441360.

The previous prime is 686240047. The next prime is 686240059. The reversal of 686240057 is 750042686.

It is a happy number.

686240057 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 a cyclic number.

It is not a de Polignac number, because 686240057 - 2⁴ = 686240041 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 686240057.

It is not an unprimeable number, because it can be changed into a prime (686240059) 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, 66383 + ... + 76020.

It is an arithmetic number, because the mean of its divisors is an integer number (88290480).

Almost surely, 2^686240057 is an apocalyptic number.

It is an amenable number.

686240057 is a deficient number, since it is larger than the sum of its proper divisors (20083783).

686240057 is a wasteful number, since it uses less digits than its factorization.

686240057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142543.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 686240057 is about 26196.1840159974. The cubic root of 686240057 is about 882.0475980538.

The spelling of 686240057 in words is "six hundred eighty-six million, two hundred forty thousand, fifty-seven".