99181320 has 128 divisors (see below), whose sum is σ = 345047040. Its totient is φ = 22337280.

The previous prime is 99181309. The next prime is 99181399. The reversal of 99181320 is 2318199.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58809 + ... + 60471.

It is an arithmetic number, because the mean of its divisors is an integer number (2695680).

Almost surely, 2^99181320 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 99181320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172523520).

99181320 is an abundant number, since it is smaller than the sum of its proper divisors (245865720).

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

99181320 is a wasteful number, since it uses less digits than its factorization.

99181320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 99181320 is about 9958.9818756738. The cubic root of 99181320 is about 462.8887522777. Note that the first 3 decimals are identical.

The spelling of 99181320 in words is "ninety-nine million, one hundred eighty-one thousand, three hundred twenty".