686532720687 has 16 divisors (see below), whose sum is σ = 998607735552. Its totient is φ = 416074317120.

The previous prime is 686532720667. The next prime is 686532720703. The reversal of 686532720687 is 786027235686.

It is a happy number.

It is not a de Polignac number, because 686532720687 - 2³⁶ = 617813243951 is a prime.

It is a super-3 number, since 3×686532720687³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686532720687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686532720647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3263238 + ... + 3467244.

It is an arithmetic number, because the mean of its divisors is an integer number (62412983472).

Almost surely, 2^686532720687 is an apocalyptic number.

686532720687 is a deficient number, since it is larger than the sum of its proper divisors (312075014865).

686532720687 is a wasteful number, since it uses less digits than its factorization.

686532720687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305998.

The product of its (nonzero) digits is 40642560, while the sum is 60.

The spelling of 686532720687 in words is "six hundred eighty-six billion, five hundred thirty-two million, seven hundred twenty thousand, six hundred eighty-seven".