687293 has 4 divisors (see below), whose sum is σ = 727740. Its totient is φ = 646848.

The previous prime is 687289. The next prime is 687299. The reversal of 687293 is 392786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 114244 = 757^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 687293 - 2² = 687289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687299) 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, 20198 + ... + 20231.

It is an arithmetic number, because the mean of its divisors is an integer number (181935).

2⁶⁸⁷²⁹³ is an apocalyptic number.

It is an amenable number.

687293 is a deficient number, since it is larger than the sum of its proper divisors (40447).

687293 is a wasteful number, since it uses less digits than its factorization.

687293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40446.

The product of its digits is 18144, while the sum is 35.

The square root of 687293 is about 829.0313624948. The cubic root of 687293 is about 88.2498495291.

The spelling of 687293 in words is "six hundred eighty-seven thousand, two hundred ninety-three".