681488 has 20 divisors (see below), whose sum is σ = 1333248. Its totient is φ = 337440.

The previous prime is 681487. The next prime is 681493. The reversal of 681488 is 884186.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 3167.

2⁶⁸¹⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

681488 is a deficient number, since it is larger than the sum of its proper divisors (651760).

681488 is a wasteful number, since it uses less digits than its factorization.

681488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 416 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 681488 is about 825.5228646137. The cubic root of 681488 is about 88.0006886998. Note that the first 3 decimals are identical.

The spelling of 681488 in words is "six hundred eighty-one thousand, four hundred eighty-eight".