681798 has 16 divisors (see below), whose sum is σ = 1468656. Its totient is φ = 209760.

The previous prime is 681787. The next prime is 681809. The reversal of 681798 is 897186.

681798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (681787) and next prime (681809).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4293 + ... + 4448.

It is an arithmetic number, because the mean of its divisors is an integer number (91791).

2⁶⁸¹⁷⁹⁸ is an apocalyptic number.

681798 is an abundant number, since it is smaller than the sum of its proper divisors (786858).

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

681798 is a wasteful number, since it uses less digits than its factorization.

681798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759.

The product of its digits is 24192, while the sum is 39.

The square root of 681798 is about 825.7106030565. The cubic root of 681798 is about 88.0140301322.

The spelling of 681798 in words is "six hundred eighty-one thousand, seven hundred ninety-eight".