681541068 has 48 divisors (see below), whose sum is σ = 1722228480. Its totient is φ = 208524864.

The previous prime is 681541061. The next prime is 681541079. The reversal of 681541068 is 860145186.

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

It is not an unprimeable number, because it can be changed into a prime (681541061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15721 + ... + 40127.

It is an arithmetic number, because the mean of its divisors is an integer number (35879760).

Almost surely, 2^681541068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681541068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861114240).

681541068 is an abundant number, since it is smaller than the sum of its proper divisors (1040687412).

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

681541068 is a wasteful number, since it uses less digits than its factorization.

681541068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24606 (or 24604 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 681541068 is about 26106.3415284486. The cubic root of 681541068 is about 880.0297286789.

The spelling of 681541068 in words is "six hundred eighty-one million, five hundred forty-one thousand, sixty-eight".