686624322560 has 352 divisors, whose sum is σ = 1902845347200. Its totient is φ = 235109744640.

The previous prime is 686624322529. The next prime is 686624322611. The reversal of 686624322560 is 65223426686.

It is a tau number, because it is divible by the number of its divisors (352).

It is a junction number, because it is equal to n+sod(n) for n = 686624322499 and 686624322508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185121986 + ... + 185125694.

Almost surely, 2^686624322560 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 686624322560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951422673600).

686624322560 is an abundant number, since it is smaller than the sum of its proper divisors (1216221024640).

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

686624322560 is a wasteful number, since it uses less digits than its factorization.

686624322560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937 (or 3919 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 50.

The spelling of 686624322560 in words is "six hundred eighty-six billion, six hundred twenty-four million, three hundred twenty-two thousand, five hundred sixty".