99881520 has 80 divisors (see below), whose sum is σ = 313929312. Its totient is φ = 26265600.

The previous prime is 99881519. The next prime is 99881527. The reversal of 99881520 is 2518899.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (99881527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14670 + ... + 20370.

Almost surely, 2^99881520 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 99881520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156964656).

99881520 is an abundant number, since it is smaller than the sum of its proper divisors (214047792).

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

99881520 is a wasteful number, since it uses less digits than its factorization.

99881520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790 (or 5784 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 99881520 is about 9994.0742442710. The cubic root of 99881520 is about 463.9754991026.

The spelling of 99881520 in words is "ninety-nine million, eight hundred eighty-one thousand, five hundred twenty".