9778640 has 40 divisors (see below), whose sum is σ = 23474688. Its totient is φ = 3784320.

The previous prime is 9778589. The next prime is 9778651. The reversal of 9778640 is 468779.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509 + ... + 4451.

Almost surely, 2^9778640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9778640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11737344).

9778640 is an abundant number, since it is smaller than the sum of its proper divisors (13696048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9778640 is a wasteful number, since it uses less digits than its factorization.

9778640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3981 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 9778640 is about 3127.0817066396. The cubic root of 9778640 is about 213.8419072863.

The spelling of 9778640 in words is "nine million, seven hundred seventy-eight thousand, six hundred forty".