686384028 has 144 divisors (see below), whose sum is σ = 1941698304. Its totient is φ = 202705920.

The previous prime is 686384011. The next prime is 686384047. The reversal of 686384028 is 820483686.

It is a happy number.

686384028 is a `hidden beast` number, since 6 + 8 + 638 + 4 + 0 + 2 + 8 = 666.

686384028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686384028² = 942246067787009568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4110001 + ... + 4110167.

It is an arithmetic number, because the mean of its divisors is an integer number (13484016).

Almost surely, 2^686384028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686384028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970849152).

686384028 is an abundant number, since it is smaller than the sum of its proper divisors (1255314276).

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

686384028 is a wasteful number, since it uses less digits than its factorization.

686384028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 686384028 is about 26198.9318102857. The cubic root of 686384028 is about 882.1092773422.

The spelling of 686384028 in words is "six hundred eighty-six million, three hundred eighty-four thousand, twenty-eight".