687774 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 226200.

The previous prime is 687773. The next prime is 687779. The reversal of 687774 is 477786.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687774.

It is not an unprimeable number, because it can be changed into a prime (687773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁶⁸⁷⁷⁷⁴ is an apocalyptic number.

687774 is an abundant number, since it is smaller than the sum of its proper divisors (706146).

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

687774 is a wasteful number, since it uses less digits than its factorization.

687774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its digits is 65856, while the sum is 39.

The square root of 687774 is about 829.3214093462. The cubic root of 687774 is about 88.2704318615.

The spelling of 687774 in words is "six hundred eighty-seven thousand, seven hundred seventy-four".