681748 has 12 divisors (see below), whose sum is σ = 1222452. Its totient is φ = 332480.

The previous prime is 681731. The next prime is 681763. The reversal of 681748 is 847186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 535824 = 382^2 + 732^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1915 + ... + 2242.

It is an arithmetic number, because the mean of its divisors is an integer number (101871).

2⁶⁸¹⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

681748 is a deficient number, since it is larger than the sum of its proper divisors (540704).

681748 is a wasteful number, since it uses less digits than its factorization.

681748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4202 (or 4200 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 681748 is about 825.6803255498. The cubic root of 681748 is about 88.0118785618.

The spelling of 681748 in words is "six hundred eighty-one thousand, seven hundred forty-eight".