9665680 has 40 divisors (see below), whose sum is σ = 23659200. Its totient is φ = 3662208.

The previous prime is 9665657. The next prime is 9665701. The reversal of 9665680 is 865669.

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

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (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, 1660 + ... + 4699.

It is an arithmetic number, because the mean of its divisors is an integer number (591480).

Almost surely, 2^9665680 is an apocalyptic number.

It is an amenable number.

9665680 is an abundant number, since it is smaller than the sum of its proper divisors (13993520).

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

9665680 is a wasteful number, since it uses less digits than its factorization.

9665680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6391 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 9665680 is about 3108.9676743254. The cubic root of 9665680 is about 213.0153030362.

The spelling of 9665680 in words is "nine million, six hundred sixty-five thousand, six hundred eighty".