683568021 has 8 divisors (see below), whose sum is σ = 920820544. Its totient is φ = 451013760.

The previous prime is 683567999. The next prime is 683568023. The reversal of 683568021 is 120865386.

It is a happy number.

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

It is not a de Polignac number, because 683568021 - 2⁷ = 683567893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683568023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174225 + ... + 1174806.

It is an arithmetic number, because the mean of its divisors is an integer number (115102568).

Almost surely, 2^683568021 is an apocalyptic number.

It is an amenable number.

683568021 is a deficient number, since it is larger than the sum of its proper divisors (237252523).

683568021 is a wasteful number, since it uses less digits than its factorization.

683568021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349131.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 683568021 is about 26145.1337919698. The cubic root of 683568021 is about 880.9012894868.

The spelling of 683568021 in words is "six hundred eighty-three million, five hundred sixty-eight thousand, twenty-one".