681853784 has 16 divisors (see below), whose sum is σ = 1281533400. Its totient is φ = 340111552.

The previous prime is 681853759. The next prime is 681853789. The reversal of 681853784 is 487358186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681853789) 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, 98357 + ... + 105060.

Almost surely, 2^681853784 is an apocalyptic number.

It is an amenable number.

681853784 is a deficient number, since it is larger than the sum of its proper divisors (599679616).

681853784 is a wasteful number, since it uses less digits than its factorization.

681853784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203842 (or 203838 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 681853784 is about 26112.3301143349. The cubic root of 681853784 is about 880.1643047202.

The spelling of 681853784 in words is "six hundred eighty-one million, eight hundred fifty-three thousand, seven hundred eighty-four".