9911880 has 96 divisors (see below), whose sum is σ = 35156160. Its totient is φ = 2401920.

The previous prime is 9911861. The next prime is 9911917. The reversal of 9911880 is 881199.

9911880 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2709 + ... + 5211.

It is an arithmetic number, because the mean of its divisors is an integer number (366210).

Almost surely, 2^9911880 is an apocalyptic number.

9911880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9911880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17578080).

9911880 is an abundant number, since it is smaller than the sum of its proper divisors (25244280).

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

9911880 is a wasteful number, since it uses less digits than its factorization.

9911880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 9911880 is about 3148.3138344199. The cubic root of 9911880 is about 214.8087717359.

The spelling of 9911880 in words is "nine million, nine hundred eleven thousand, eight hundred eighty".