681928017 has 4 divisors (see below), whose sum is σ = 909237360. Its totient is φ = 454618676.

The previous prime is 681928007. The next prime is 681928033. The reversal of 681928017 is 710829186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681928017 - 2⁴ = 681928001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681928017.

It is not an unprimeable number, because it can be changed into a prime (681928007) 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, 113654667 + ... + 113654672.

It is an arithmetic number, because the mean of its divisors is an integer number (227309340).

Almost surely, 2^681928017 is an apocalyptic number.

It is an amenable number.

681928017 is a deficient number, since it is larger than the sum of its proper divisors (227309343).

681928017 is a wasteful number, since it uses less digits than its factorization.

681928017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227309342.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 681928017 is about 26113.7514922694. The cubic root of 681928017 is about 880.1962445424.

The spelling of 681928017 in words is "six hundred eighty-one million, nine hundred twenty-eight thousand, seventeen".