687743 has 8 divisors (see below), whose sum is σ = 827520. Its totient is φ = 558360.

The previous prime is 687737. The next prime is 687749. The reversal of 687743 is 347786.

It is an interprime number because it is at equal distance from previous prime (687737) and next prime (687749).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687743 - 2⁶ = 687679 is a prime.

It is a Duffinian 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 687743.

It is not an unprimeable number, because it can be changed into a prime (687749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2453 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (103440).

2⁶⁸⁷⁷⁴³ is an apocalyptic number.

687743 is a deficient number, since it is larger than the sum of its proper divisors (139777).

687743 is a wasteful number, since it uses less digits than its factorization.

687743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197.

The product of its digits is 28224, while the sum is 35.

The square root of 687743 is about 829.3027191563. The cubic root of 687743 is about 88.2691056388.

The spelling of 687743 in words is "six hundred eighty-seven thousand, seven hundred forty-three".