9900920664 has 24 divisors (see below), whose sum is σ = 26814993660. Its totient is φ = 3300306864.

The previous prime is 9900920609. The next prime is 9900920669. The reversal of 9900920664 is 4660290099.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900920669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68756322 + ... + 68756465.

Almost surely, 2^9900920664 is an apocalyptic number.

It is an amenable number.

9900920664 is an abundant number, since it is smaller than the sum of its proper divisors (16914072996).

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

9900920664 is a wasteful number, since it uses less digits than its factorization.

9900920664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137512799 (or 137512792 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 9900920664 is about 99503.3701137806. The cubic root of 9900920664 is about 2147.2957284573.

The spelling of 9900920664 in words is "nine billion, nine hundred million, nine hundred twenty thousand, six hundred sixty-four".