681968458 has 8 divisors (see below), whose sum is σ = 1027801440. Its totient is φ = 339367980.

The previous prime is 681968453. The next prime is 681968467. The reversal of 681968458 is 854869186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 681968399 and 681968408.

It is not an unprimeable number, because it can be changed into a prime (681968453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807598 + ... + 808441.

It is an arithmetic number, because the mean of its divisors is an integer number (128475180).

Almost surely, 2^681968458 is an apocalyptic number.

681968458 is a deficient number, since it is larger than the sum of its proper divisors (345832982).

681968458 is a wasteful number, since it uses less digits than its factorization.

681968458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616252.

The product of its digits is 3317760, while the sum is 55.

The square root of 681968458 is about 26114.5258046169. The cubic root of 681968458 is about 880.2136438924.

The spelling of 681968458 in words is "six hundred eighty-one million, nine hundred sixty-eight thousand, four hundred fifty-eight".