681469727958 has 80 divisors (see below), whose sum is σ = 1560114293760. Its totient is φ = 222233931504.

The previous prime is 681469727909. The next prime is 681469728001. The reversal of 681469727958 is 859727964186.

681469727958 is a `hidden beast` number, since 6 + 8 + 1 + 469 + 72 + 7 + 95 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20411683 + ... + 20445041.

It is an arithmetic number, because the mean of its divisors is an integer number (19501428672).

Almost surely, 2^681469727958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681469727958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780057146880).

681469727958 is an abundant number, since it is smaller than the sum of its proper divisors (878644565802).

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

681469727958 is a wasteful number, since it uses less digits than its factorization.

681469727958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36103 (or 36094 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 72.

The spelling of 681469727958 in words is "six hundred eighty-one billion, four hundred sixty-nine million, seven hundred twenty-seven thousand, nine hundred fifty-eight".