681878742 has 8 divisors (see below), whose sum is σ = 1363757496. Its totient is φ = 227292912.

The previous prime is 681878741. The next prime is 681878777. The reversal of 681878742 is 247878186.

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

681878742 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681878741) 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 3 ways as a sum of consecutive naturals, for example, 56823223 + ... + 56823234.

It is an arithmetic number, because the mean of its divisors is an integer number (170469687).

Almost surely, 2^681878742 is an apocalyptic number.

681878742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681878742 is a wasteful number, since it uses less digits than its factorization.

681878742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113646462.

The product of its digits is 1204224, while the sum is 51.

The square root of 681878742 is about 26112.8080068000. The cubic root of 681878742 is about 880.1750435195.

The spelling of 681878742 in words is "six hundred eighty-one million, eight hundred seventy-eight thousand, seven hundred forty-two".