686107722528 has 54 divisors (see below), whose sum is σ = 1951158811329. Its totient is φ = 228697888512.

The previous prime is 686107722527. The next prime is 686107722571. The reversal of 686107722528 is 825227701686.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

686107722528 is a `hidden beast` number, since 6 + 8 + 6 + 107 + 7 + 2 + 2 + 528 = 666.

686107722528 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 2 ways, for example, as 669955346064 + 16152376464 = 818508^2 + 127092^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=585708.

It is not an unprimeable number, because it can be changed into a prime (686107722527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14032588 + ... + 14081396.

Almost surely, 2^686107722528 is an apocalyptic number.

It is an amenable number.

686107722528 is an abundant number, since it is smaller than the sum of its proper divisors (1265051088801).

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

686107722528 is an frugal number, since it uses more digits than its factorization.

686107722528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97634 (or 48814 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 686107722528 in words is "six hundred eighty-six billion, one hundred seven million, seven hundred twenty-two thousand, five hundred twenty-eight".