681817998 has 8 divisors (see below), whose sum is σ = 1363636008. Its totient is φ = 227272664.

The previous prime is 681817993. The next prime is 681818057. The reversal of 681817998 is 899718186.

It is a sphenic number, since it is the product of 3 distinct primes.

681817998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681817993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56818161 + ... + 56818172.

It is an arithmetic number, because the mean of its divisors is an integer number (170454501).

Almost surely, 2^681817998 is an apocalyptic number.

681817998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

681817998 is a wasteful number, since it uses less digits than its factorization.

681817998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113636338.

The product of its digits is 1741824, while the sum is 57.

The square root of 681817998 is about 26111.6448735042. The cubic root of 681817998 is about 880.1489064478.

The spelling of 681817998 in words is "six hundred eighty-one million, eight hundred seventeen thousand, nine hundred ninety-eight".