686544080 has 40 divisors (see below), whose sum is σ = 1600270344. Its totient is φ = 273920000.

The previous prime is 686544077. The next prime is 686544107. The reversal of 686544080 is 80445686.

686544080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 164147344 + 522396736 = 12812^2 + 22856^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21380 + ... + 42780.

Almost surely, 2^686544080 is an apocalyptic number.

It is an amenable number.

686544080 is an abundant number, since it is smaller than the sum of its proper divisors (913726264).

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

686544080 is a wasteful number, since it uses less digits than its factorization.

686544080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21815 (or 21809 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 686544080 is about 26201.9861842571. The cubic root of 686544080 is about 882.1778358439.

The spelling of 686544080 in words is "six hundred eighty-six million, five hundred forty-four thousand, eighty".