681785546 has 24 divisors (see below), whose sum is σ = 1109452140. Its totient is φ = 314086656.

The previous prime is 681785519. The next prime is 681785567. The reversal of 681785546 is 645587186.

It can be written as a sum of positive squares in 6 ways, for example, as 157879225 + 523906321 = 12565^2 + 22889^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681785494 and 681785503.

It is an unprimeable number.

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, 219170 + ... + 222258.

Almost surely, 2^681785546 is an apocalyptic number.

681785546 is a deficient number, since it is larger than the sum of its proper divisors (427666594).

681785546 is a wasteful number, since it uses less digits than its factorization.

681785546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770 (or 3757 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 50.

The square root of 681785546 is about 26111.0234575361. The cubic root of 681785546 is about 880.1349422885.

The spelling of 681785546 in words is "six hundred eighty-one million, seven hundred eighty-five thousand, five hundred forty-six".