9990644448 has 96 divisors (see below), whose sum is σ = 27916358400. Its totient is φ = 3119440896.

The previous prime is 9990644423. The next prime is 9990644459. The reversal of 9990644448 is 8444460999.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131565 + ... + 193107.

It is an arithmetic number, because the mean of its divisors is an integer number (290795400).

Almost surely, 2^9990644448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9990644448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13958179200).

9990644448 is an abundant number, since it is smaller than the sum of its proper divisors (17925713952).

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

9990644448 is a wasteful number, since it uses less digits than its factorization.

9990644448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61664 (or 61656 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 57.

The square root of 9990644448 is about 99953.2112940850. The cubic root of 9990644448 is about 2153.7626162085.

The spelling of 9990644448 in words is "nine billion, nine hundred ninety million, six hundred forty-four thousand, four hundred forty-eight".