9646640 has 40 divisors (see below), whose sum is σ = 23041680. Its totient is φ = 3753216.

The previous prime is 9646639. The next prime is 9646643. The reversal of 9646640 is 466469.

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

It is a self number, because there is not a number n which added to its sum of digits gives 9646640.

It is not an unprimeable number, because it can be changed into a prime (9646643) 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, 1331 + ... + 4589.

It is an arithmetic number, because the mean of its divisors is an integer number (576042).

Almost surely, 2^9646640 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 9646640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11520840).

9646640 is an abundant number, since it is smaller than the sum of its proper divisors (13395040).

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

9646640 is a wasteful number, since it uses less digits than its factorization.

9646640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309 (or 3303 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 9646640 is about 3105.9040551826. The cubic root of 9646640 is about 212.8753412536.

The spelling of 9646640 in words is "nine million, six hundred forty-six thousand, six hundred forty".