9720638 has 8 divisors (see below), whose sum is σ = 14657088. Its totient is φ = 4834944.

The previous prime is 9720631. The next prime is 9720653. The reversal of 9720638 is 8360279.

9720638 is digitally balanced in base 2, 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 Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9720598 and 9720607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9720631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12206 + ... + 12977.

It is an arithmetic number, because the mean of its divisors is an integer number (1832136).

Almost surely, 2^9720638 is an apocalyptic number.

9720638 is a deficient number, since it is larger than the sum of its proper divisors (4936450).

9720638 is a wasteful number, since it uses less digits than its factorization.

9720638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25378.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 9720638 is about 3117.7937712427. The cubic root of 9720638 is about 213.4182675045.

The spelling of 9720638 in words is "nine million, seven hundred twenty thousand, six hundred thirty-eight".