9870656640 has 128 divisors (see below), whose sum is σ = 33883012800. Its totient is φ = 2429693952.

The previous prime is 9870656639. The next prime is 9870656651. The reversal of 9870656640 is 466560789.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 172770 + ... + 222689.

Almost surely, 2^9870656640 is an apocalyptic number.

It is an amenable number.

9870656640 is an abundant number, since it is smaller than the sum of its proper divisors (24012356160).

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

9870656640 is a wasteful number, since it uses less digits than its factorization.

9870656640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395494 (or 395482 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The square root of 9870656640 is about 99351.1783523477. The cubic root of 9870656640 is about 2145.1056245225.

The spelling of 9870656640 in words is "nine billion, eight hundred seventy million, six hundred fifty-six thousand, six hundred forty".