681056487 has 12 divisors (see below), whose sum is σ = 984774024. Its totient is φ = 453564240.

The previous prime is 681056479. The next prime is 681056491. The reversal of 681056487 is 784650186.

It is a happy number.

681056487 is a `hidden beast` number, since 6 + 8 + 1 + 0 + 564 + 87 = 666.

It is not a de Polignac number, because 681056487 - 2³ = 681056479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681056477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30228 + ... + 47705.

It is an arithmetic number, because the mean of its divisors is an integer number (82064502).

Almost surely, 2^681056487 is an apocalyptic number.

681056487 is a deficient number, since it is larger than the sum of its proper divisors (303717537).

681056487 is a wasteful number, since it uses less digits than its factorization.

681056487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78910 (or 78907 counting only the distinct ones).

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

The square root of 681056487 is about 26097.0589722290. The cubic root of 681056487 is about 879.8211099007.

The spelling of 681056487 in words is "six hundred eighty-one million, fifty-six thousand, four hundred eighty-seven".