681612 has 24 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 224016.

The previous prime is 681607. The next prime is 681613. The reversal of 681612 is 216186.

It is not an unprimeable number, because it can be changed into a prime (681613) by changing a digit.

681612 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (67200).

2⁶⁸¹⁶¹² is an apocalyptic number.

It is an amenable number.

681612 is an abundant number, since it is smaller than the sum of its proper divisors (931188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681612 is a wasteful number, since it uses less digits than its factorization.

681612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 803 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 681612 is about 825.5979651138. The cubic root of 681612 is about 88.0060257582.

Adding to 681612 its reverse (216186), we get a palindrome (897798).

It can be divided in two parts, 6 and 81612, that added together give a palindrome (81618).

The spelling of 681612 in words is "six hundred eighty-one thousand, six hundred twelve".