687801 has 4 divisors (see below), whose sum is σ = 917072. Its totient is φ = 458532.

The previous prime is 687787. The next prime is 687809. The reversal of 687801 is 108786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 687801 - 2⁶ = 687737 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687809) 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 3 ways as a sum of consecutive naturals, for example, 114631 + ... + 114636.

It is an arithmetic number, because the mean of its divisors is an integer number (229268).

2⁶⁸⁷⁸⁰¹ is an apocalyptic number.

It is an amenable number.

687801 is a deficient number, since it is larger than the sum of its proper divisors (229271).

687801 is a wasteful number, since it uses less digits than its factorization.

687801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229270.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 687801 is about 829.3376875556. The cubic root of 687801 is about 88.2715869263.

The spelling of 687801 in words is "six hundred eighty-seven thousand, eight hundred one".