681733 has 6 divisors (see below), whose sum is σ = 737394. Its totient is φ = 626544.

The previous prime is 681731. The next prime is 681763. The reversal of 681733 is 337186.

It can be written as a sum of positive squares in 3 ways, for example, as 294849 + 386884 = 543^2 + 622^2 .

It is not a de Polignac number, because 681733 - 2¹ = 681731 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 (681731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2863 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (122899).

2⁶⁸¹⁷³³ is an apocalyptic number.

It is an amenable number.

681733 is a deficient number, since it is larger than the sum of its proper divisors (55661).

681733 is an equidigital number, since it uses as much as digits as its factorization.

681733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 242 counting only the distinct ones).

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

The square root of 681733 is about 825.6712420813. The cubic root of 681733 is about 88.0112330702.

The spelling of 681733 in words is "six hundred eighty-one thousand, seven hundred thirty-three".