687313 has 4 divisors (see below), whose sum is σ = 749808. Its totient is φ = 624820.

The previous prime is 687311. The next prime is 687317. The reversal of 687313 is 313786.

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 a cyclic number.

It is not a de Polignac number, because 687313 - 2¹ = 687311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31231 + ... + 31252.

It is an arithmetic number, because the mean of its divisors is an integer number (187452).

2⁶⁸⁷³¹³ is an apocalyptic number.

It is an amenable number.

687313 is a deficient number, since it is larger than the sum of its proper divisors (62495).

687313 is a wasteful number, since it uses less digits than its factorization.

687313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62494.

The product of its digits is 3024, while the sum is 28.

The square root of 687313 is about 829.0434246769. The cubic root of 687313 is about 88.2507055346.

It can be divided in two parts, 6873 and 13, that added together give a palindrome (6886).

The spelling of 687313 in words is "six hundred eighty-seven thousand, three hundred thirteen".