681288443 has 24 divisors (see below), whose sum is σ = 766284288. Its totient is φ = 605088000.

The previous prime is 681288427. The next prime is 681288463. The reversal of 681288443 is 344882186.

It is not a de Polignac number, because 681288443 - 2⁴ = 681288427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681288394 and 681288403.

It is not an unprimeable number, because it can be changed into a prime (681288403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1778630 + ... + 1779012.

It is an arithmetic number, because the mean of its divisors is an integer number (31928512).

Almost surely, 2^681288443 is an apocalyptic number.

681288443 is a deficient number, since it is larger than the sum of its proper divisors (84995845).

681288443 is a wasteful number, since it uses less digits than its factorization.

681288443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 696 counting only the distinct ones).

The product of its digits is 294912, while the sum is 44.

The square root of 681288443 is about 26101.5026962051. The cubic root of 681288443 is about 879.9209824884.

The spelling of 681288443 in words is "six hundred eighty-one million, two hundred eighty-eight thousand, four hundred forty-three".