681963842 has 16 divisors (see below), whose sum is σ = 1174236480. Its totient is φ = 290981328.

The previous prime is 681963829. The next prime is 681963851. The reversal of 681963842 is 248369186.

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 7 ways as a sum of consecutive naturals, for example, 104117 + ... + 110472.

It is an arithmetic number, because the mean of its divisors is an integer number (73389780).

Almost surely, 2^681963842 is an apocalyptic number.

681963842 is a deficient number, since it is larger than the sum of its proper divisors (492272638).

681963842 is a wasteful number, since it uses less digits than its factorization.

681963842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214825.

The product of its digits is 497664, while the sum is 47.

The square root of 681963842 is about 26114.4374245359. The cubic root of 681963842 is about 880.2116579377.

The spelling of 681963842 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, eight hundred forty-two".