9578721 has 16 divisors (see below), whose sum is σ = 13303808. Its totient is φ = 6123600.

The previous prime is 9578711. The next prime is 9578749. The reversal of 9578721 is 1278759.

It is not a de Polignac number, because 9578721 - 2⁹ = 9578209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9578721.

It is not an unprimeable number, because it can be changed into a prime (9578711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11406 + ... + 12216.

It is an arithmetic number, because the mean of its divisors is an integer number (831488).

Almost surely, 2^9578721 is an apocalyptic number.

It is an amenable number.

9578721 is a deficient number, since it is larger than the sum of its proper divisors (3725087).

9578721 is a wasteful number, since it uses less digits than its factorization.

9578721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its digits is 35280, while the sum is 39.

The square root of 9578721 is about 3094.9508881402. The cubic root of 9578721 is about 212.3745677289.

The spelling of 9578721 in words is "nine million, five hundred seventy-eight thousand, seven hundred twenty-one".