687555555786 has 96 divisors (see below), whose sum is σ = 1725343633728. Its totient is φ = 195568197120.

The previous prime is 687555555781. The next prime is 687555555829.

687555555786 is a `hidden beast` number, since 68 + 7 + 5 + 5 + 5 + 5 + 557 + 8 + 6 = 666.

687555555786 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (687555555781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 981705 + ... + 1529331.

It is an arithmetic number, because the mean of its divisors is an integer number (17972329518).

Almost surely, 2^687555555786 is an apocalyptic number.

687555555786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 687555555786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862671816864).

687555555786 is an abundant number, since it is smaller than the sum of its proper divisors (1037788077942).

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

687555555786 is a wasteful number, since it uses less digits than its factorization.

687555555786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548036 (or 548033 counting only the distinct ones).

The product of its digits is 1764000000, while the sum is 72.

The spelling of 687555555786 in words is "six hundred eighty-seven billion, five hundred fifty-five million, five hundred fifty-five thousand, seven hundred eighty-six".