681045568 has 112 divisors (see below), whose sum is σ = 1646797824. Its totient is φ = 272793600.

The previous prime is 681045559. The next prime is 681045577. The reversal of 681045568 is 865540186.

It is an interprime number because it is at equal distance from previous prime (681045559) and next prime (681045577).

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1698168 + ... + 1698568.

It is an arithmetic number, because the mean of its divisors is an integer number (14703552).

Almost surely, 2^681045568 is an apocalyptic number.

681045568 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681045568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823398912).

681045568 is an abundant number, since it is smaller than the sum of its proper divisors (965752256).

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

681045568 is a wasteful number, since it uses less digits than its factorization.

681045568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 681045568 is about 26096.8497715720. The cubic root of 681045568 is about 879.8164079813.

It can be divided in two parts, 68 and 1045568, that multiplied together give a square (71098624 = 8432²).

The spelling of 681045568 in words is "six hundred eighty-one million, forty-five thousand, five hundred sixty-eight".