9720432643 has 8 divisors (see below), whose sum is σ = 9966672576. Its totient is φ = 9474628800.

The previous prime is 9720432637. The next prime is 9720432679. The reversal of 9720432643 is 3462340279.

9720432643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 9720432643 - 2⁹ = 9720432131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9720432596 and 9720432605.

It is not an unprimeable number, because it can be changed into a prime (9720432343) 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, 63643 + ... + 153268.

It is an arithmetic number, because the mean of its divisors is an integer number (1245834072).

Almost surely, 2^9720432643 is an apocalyptic number.

9720432643 is a deficient number, since it is larger than the sum of its proper divisors (246239933).

9720432643 is a wasteful number, since it uses less digits than its factorization.

9720432643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218045.

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 9720432643 is about 98592.2544777225. The cubic root of 9720432643 is about 2134.1676461129.

The spelling of 9720432643 in words is "nine billion, seven hundred twenty million, four hundred thirty-two thousand, six hundred forty-three".