99581328 has 180 divisors, whose sum is σ = 353937168. Its totient is φ = 25845120.

The previous prime is 99581323. The next prime is 99581347. The reversal of 99581328 is 82318599.

It is a happy number.

99581328 is a nontrivial binomial coefficient, being equal to C(14113, 2).

It is not an unprimeable number, because it can be changed into a prime (99581323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 76975 + ... + 78257.

Almost surely, 2^99581328 is an apocalyptic number.

99581328 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

99581328 is the 14112-nd triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99581328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176968584).

99581328 is an abundant number, since it is smaller than the sum of its proper divisors (254355840).

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

99581328 is a wasteful number, since it uses less digits than its factorization.

99581328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322 (or 1306 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 99581328 is about 9979.0444432320. The cubic root of 99581328 is about 463.5102094852.

The spelling of 99581328 in words is "ninety-nine million, five hundred eighty-one thousand, three hundred twenty-eight".