686340320 has 72 divisors (see below), whose sum is σ = 1722586824. Its totient is φ = 258369536.

The previous prime is 686340313. The next prime is 686340323. The reversal of 686340320 is 23043686.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686340323) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 38819 + ... + 53661.

It is an arithmetic number, because the mean of its divisors is an integer number (23924817).

Almost surely, 2^686340320 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 686340320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861293412).

686340320 is an abundant number, since it is smaller than the sum of its proper divisors (1036246504).

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

686340320 is a wasteful number, since it uses less digits than its factorization.

686340320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14892 (or 14867 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 686340320 is about 26198.0976408593. The cubic root of 686340320 is about 882.0905531056.

The spelling of 686340320 in words is "six hundred eighty-six million, three hundred forty thousand, three hundred twenty".