9990640 has 40 divisors (see below), whose sum is σ = 25342128. Its totient is φ = 3632640.

The previous prime is 9990569. The next prime is 9990653. The reversal of 9990640 is 460999.

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 9990640.

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, 4797 + ... + 6556.

Almost surely, 2^9990640 is an apocalyptic number.

It is an amenable number.

9990640 is an abundant number, since it is smaller than the sum of its proper divisors (15351488).

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

9990640 is a wasteful number, since it uses less digits than its factorization.

9990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11377 (or 11371 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 9990640 is about 3160.7973677539. The cubic root of 9990640 is about 215.3762296578.

The spelling of 9990640 in words is "nine million, nine hundred ninety thousand, six hundred forty".