686389508 has 24 divisors (see below), whose sum is σ = 1391588352. Its totient is φ = 290136384.

The previous prime is 686389493. The next prime is 686389511. The reversal of 686389508 is 805983686.

It is a happy number.

It is a super-2 number, since 2×686389508² = 942261113384964128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686389508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165860 + ... + 169947.

It is an arithmetic number, because the mean of its divisors is an integer number (57982848).

Almost surely, 2^686389508 is an apocalyptic number.

It is an amenable number.

686389508 is an abundant number, since it is smaller than the sum of its proper divisors (705198844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686389508 is a wasteful number, since it uses less digits than its factorization.

686389508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335891 (or 335889 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 686389508 is about 26199.0363944936. The cubic root of 686389508 is about 882.1116248842. Note that the first 3 decimals are identical.

The spelling of 686389508 in words is "six hundred eighty-six million, three hundred eighty-nine thousand, five hundred eight".