9821428609 has 8 divisors (see below), whose sum is σ = 9853704000. Its totient is φ = 9789204816.

The previous prime is 9821428607. The next prime is 9821428613. The reversal of 9821428609 is 9068241289.

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

It is a cyclic number.

It is not a de Polignac number, because 9821428609 - 2¹ = 9821428607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9821428607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388642 + ... + 413140.

It is an arithmetic number, because the mean of its divisors is an integer number (1231713000).

Almost surely, 2^9821428609 is an apocalyptic number.

It is an amenable number.

9821428609 is a deficient number, since it is larger than the sum of its proper divisors (32275391).

9821428609 is a wasteful number, since it uses less digits than its factorization.

9821428609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25799.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 9821428609 is about 99103.1210860687. The cubic root of 9821428609 is about 2141.5335769109.

The spelling of 9821428609 in words is "nine billion, eight hundred twenty-one million, four hundred twenty-eight thousand, six hundred nine".