9778641 has 4 divisors (see below), whose sum is σ = 13038192. Its totient is φ = 6519092.

The previous prime is 9778589. The next prime is 9778651. The reversal of 9778641 is 1468779.

9778641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9778641 - 2¹¹ = 9776593 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9778593 and 9778602.

It is not an unprimeable number, because it can be changed into a prime (9778651) 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, 1629771 + ... + 1629776.

It is an arithmetic number, because the mean of its divisors is an integer number (3259548).

Almost surely, 2^9778641 is an apocalyptic number.

It is an amenable number.

9778641 is a deficient number, since it is larger than the sum of its proper divisors (3259551).

9778641 is a wasteful number, since it uses less digits than its factorization.

9778641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259550.

The product of its digits is 84672, while the sum is 42.

The square root of 9778641 is about 3127.0818665331. The cubic root of 9778641 is about 213.8419145757.

Subtracting from 9778641 its product of digits (84672), we obtain a palindrome (9693969).

The spelling of 9778641 in words is "nine million, seven hundred seventy-eight thousand, six hundred forty-one".