686648832 has 80 divisors (see below), whose sum is σ = 1835425680. Its totient is φ = 228114432.

The previous prime is 686648827. The next prime is 686648869. The reversal of 686648832 is 238846686.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 627678 + ... + 628770.

It is an arithmetic number, because the mean of its divisors is an integer number (22942821).

Almost surely, 2^686648832 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 686648832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917712840).

686648832 is an abundant number, since it is smaller than the sum of its proper divisors (1148776848).

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

686648832 is a wasteful number, since it uses less digits than its factorization.

686648832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523 (or 1507 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The square root of 686648832 is about 26203.9850404476. The cubic root of 686648832 is about 882.2227007432. Note that the first 3 decimals are identical.

The spelling of 686648832 in words is "six hundred eighty-six million, six hundred forty-eight thousand, eight hundred thirty-two".