687735537786 has 48 divisors (see below), whose sum is σ = 1631737673280. Its totient is φ = 207612279360.

The previous prime is 687735537781. The next prime is 687735537833.

It is a happy number.

687735537786 is a `hidden beast` number, since 6 + 8 + 7 + 7 + 3 + 5 + 537 + 7 + 86 = 666.

687735537786 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (687735537781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6551371 + ... + 6655518.

It is an arithmetic number, because the mean of its divisors is an integer number (33994534860).

Almost surely, 2^687735537786 is an apocalyptic number.

687735537786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

687735537786 is an abundant number, since it is smaller than the sum of its proper divisors (944002135494).

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

687735537786 is a wasteful number, since it uses less digits than its factorization.

687735537786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13207171 (or 13207168 counting only the distinct ones).

The product of its digits is 1244678400, while the sum is 72.

The spelling of 687735537786 in words is "six hundred eighty-seven billion, seven hundred thirty-five million, five hundred thirty-seven thousand, seven hundred eighty-six".