687685676675624 has 128 divisors (see below), whose sum is σ = 1421399077862400. Its totient is φ = 309319871938560.

The previous prime is 687685676675603. The next prime is 687685676675717. The reversal of 687685676675624 is 426576676586786.

It is a self number, because there is not a number n which added to its sum of digits gives 687685676675624.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18906469502 + ... + 18906505874.

It is an arithmetic number, because the mean of its divisors is an integer number (11104680295800).

Almost surely, 2^{687685676675624} 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 687685676675624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710699538931200).

687685676675624 is an abundant number, since it is smaller than the sum of its proper divisors (733713401186776).

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

687685676675624 is a wasteful number, since it uses less digits than its factorization.

687685676675624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355 (or 42351 counting only the distinct ones).

The product of its digits is 204838502400, while the sum is 89.

The spelling of 687685676675624 in words is "six hundred eighty-seven trillion, six hundred eighty-five billion, six hundred seventy-six million, six hundred seventy-five thousand, six hundred twenty-four".