681588 has 24 divisors (see below), whose sum is σ = 1767360. Its totient is φ = 227160.

The previous prime is 681563. The next prime is 681589. The reversal of 681588 is 885186.

681588 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681589) by changing a digit.

681588 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, 3048 + ... + 3263.

It is an arithmetic number, because the mean of its divisors is an integer number (73640).

2⁶⁸¹⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

681588 is an abundant number, since it is smaller than the sum of its proper divisors (1085772).

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

681588 is a wasteful number, since it uses less digits than its factorization.

681588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324 (or 6316 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 681588 is about 825.5834300663. The cubic root of 681588 is about 88.0049928297.

It can be divided in two parts, 6815 and 88, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 681588 in words is "six hundred eighty-one thousand, five hundred eighty-eight".