681796144 has 20 divisors (see below), whose sum is σ = 1363593280. Its totient is φ = 329901120.

The previous prime is 681796139. The next prime is 681796211. The reversal of 681796144 is 441697186.

681796144 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 681796094 and 681796103.

It is an unprimeable number.

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, 686799 + ... + 687790.

It is an arithmetic number, because the mean of its divisors is an integer number (68179664).

Almost surely, 2^681796144 is an apocalyptic number.

It is an amenable number.

681796144 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.

681796144 is a wasteful number, since it uses less digits than its factorization.

681796144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374628 (or 1374622 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 681796144 is about 26111.2263978542. The cubic root of 681796144 is about 880.1395026775.

The spelling of 681796144 in words is "six hundred eighty-one million, seven hundred ninety-six thousand, one hundred forty-four".