686776321 has 8 divisors (see below), whose sum is σ = 856240704. Its totient is φ = 535150320.

The previous prime is 686776303. The next prime is 686776327. The reversal of 686776321 is 123677686.

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 686776321 - 2²¹ = 684679169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686776327) 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, 4459510 + ... + 4459663.

It is an arithmetic number, because the mean of its divisors is an integer number (107030088).

Almost surely, 2^686776321 is an apocalyptic number.

It is an amenable number.

686776321 is a deficient number, since it is larger than the sum of its proper divisors (169464383).

686776321 is a wasteful number, since it uses less digits than its factorization.

686776321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8919191.

The product of its digits is 508032, while the sum is 46.

The square root of 686776321 is about 26206.4175537215. The cubic root of 686776321 is about 882.2772976611.

The spelling of 686776321 in words is "six hundred eighty-six million, seven hundred seventy-six thousand, three hundred twenty-one".