686444320 has 24 divisors (see below), whose sum is σ = 1621725084. Its totient is φ = 274577664.

The previous prime is 686444267. The next prime is 686444321. The reversal of 686444320 is 23444686.

It can be written as a sum of positive squares in 2 ways, for example, as 570063376 + 116380944 = 23876^2 + 10788^2 .

It is a super-3 number, since 3×686444320³ (a number of 27 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 686444320.

It is not an unprimeable number, because it can be changed into a prime (686444321) 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 3 ways as a sum of consecutive naturals, for example, 2144979 + ... + 2145298.

Almost surely, 2^686444320 is an apocalyptic number.

It is an amenable number.

686444320 is an abundant number, since it is smaller than the sum of its proper divisors (935280764).

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

686444320 is a wasteful number, since it uses less digits than its factorization.

686444320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290292 (or 4290284 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 686444320 is about 26200.0824426184. The cubic root of 686444320 is about 882.1351047572.

The spelling of 686444320 in words is "six hundred eighty-six million, four hundred forty-four thousand, three hundred twenty".