9994881888 has 72 divisors (see below), whose sum is σ = 28440030528. Its totient is φ = 3329624832.

The previous prime is 9994881763. The next prime is 9994881901. The reversal of 9994881888 is 8881884999.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515506 + ... + 534542.

It is an arithmetic number, because the mean of its divisors is an integer number (395000424).

Almost surely, 2^9994881888 is an apocalyptic number.

It is an amenable number.

9994881888 is an abundant number, since it is smaller than the sum of its proper divisors (18445148640).

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

9994881888 is a wasteful number, since it uses less digits than its factorization.

9994881888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20876 (or 20865 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 72.

The square root of 9994881888 is about 99974.4061647780. The cubic root of 9994881888 is about 2154.0670727065.

The spelling of 9994881888 in words is "nine billion, nine hundred ninety-four million, eight hundred eighty-one thousand, eight hundred eighty-eight".