686762321 has 8 divisors (see below), whose sum is σ = 785723520. Its totient is φ = 588014208.

The previous prime is 686762317. The next prime is 686762347. The reversal of 686762321 is 123267686.

It is a happy number.

686762321 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 686762321 - 2² = 686762317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686702321) 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, 46301 + ... + 59306.

It is an arithmetic number, because the mean of its divisors is an integer number (98215440).

Almost surely, 2^686762321 is an apocalyptic number.

It is an amenable number.

686762321 is a deficient number, since it is larger than the sum of its proper divisors (98961199).

686762321 is a wasteful number, since it uses less digits than its factorization.

686762321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106543.

The product of its digits is 145152, while the sum is 41.

The square root of 686762321 is about 26206.1504422149. The cubic root of 686762321 is about 882.2713025184.

The spelling of 686762321 in words is "six hundred eighty-six million, seven hundred sixty-two thousand, three hundred twenty-one".