681448689 has 12 divisors (see below), whose sum is σ = 1042215876. Its totient is φ = 427575552.

The previous prime is 681448687. The next prime is 681448709. The reversal of 681448689 is 986844186.

681448689 is a `hidden beast` number, since 6 + 81 + 4 + 486 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 494306289 + 187142400 = 22233^2 + 13680^2 .

It is not a de Polignac number, because 681448689 - 2¹ = 681448687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681448681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2226804 + ... + 2227109.

It is an arithmetic number, because the mean of its divisors is an integer number (86851323).

Almost surely, 2^681448689 is an apocalyptic number.

It is an amenable number.

681448689 is a deficient number, since it is larger than the sum of its proper divisors (360767187).

681448689 is a wasteful number, since it uses less digits than its factorization.

681448689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4453936 (or 4453933 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 681448689 is about 26104.5721857302. The cubic root of 681448689 is about 879.9899658808.

The spelling of 681448689 in words is "six hundred eighty-one million, four hundred forty-eight thousand, six hundred eighty-nine".