681845760 has 132 divisors (see below), whose sum is σ = 2362737468. Its totient is φ = 181813248.

The previous prime is 681845701. The next prime is 681845771. The reversal of 681845760 is 67548186.

It is a happy number.

681845760 is a `hidden beast` number, since 68 + 18 + 4 + 576 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 247873536 + 433972224 = 15744^2 + 20832^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38682 + ... + 53478.

Almost surely, 2^681845760 is an apocalyptic number.

681845760 is a gapful number since it is divisible by the number (60) 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 681845760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181368734).

681845760 is an abundant number, since it is smaller than the sum of its proper divisors (1680891708).

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

681845760 is a wasteful number, since it uses less digits than its factorization.

681845760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14828 (or 14807 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 681845760 is about 26112.1764699919. The cubic root of 681845760 is about 880.1608521393.

The spelling of 681845760 in words is "six hundred eighty-one million, eight hundred forty-five thousand, seven hundred sixty".