9961664 has 28 divisors (see below), whose sum is σ = 20409408. Its totient is φ = 4819200.

The previous prime is 9961657. The next prime is 9961669. The reversal of 9961664 is 4661699.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9961669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527 + ... + 4494.

Almost surely, 2^9961664 is an apocalyptic number.

It is an amenable number.

9961664 is an abundant number, since it is smaller than the sum of its proper divisors (10447744).

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

9961664 is a wasteful number, since it uses less digits than its factorization.

9961664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064 (or 5054 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 9961664 is about 3156.2103858900. The cubic root of 9961664 is about 215.1678084175.

The spelling of 9961664 in words is "nine million, nine hundred sixty-one thousand, six hundred sixty-four".