99881728 has 36 divisors (see below), whose sum is σ = 201399408. Its totient is φ = 49433600.

The previous prime is 99881711. The next prime is 99881729. The reversal of 99881728 is 82718899.

It is not an unprimeable number, because it can be changed into a prime (99881729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23925 + ... + 27787.

It is an arithmetic number, because the mean of its divisors is an integer number (5594428).

Almost surely, 2^99881728 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 99881728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100699704).

99881728 is an abundant number, since it is smaller than the sum of its proper divisors (101517680).

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

99881728 is a wasteful number, since it uses less digits than its factorization.

99881728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980 (or 3966 counting only the distinct ones).

The product of its digits is 580608, while the sum is 52.

The square root of 99881728 is about 9994.0846504320. The cubic root of 99881728 is about 463.9758211737.

The spelling of 99881728 in words is "ninety-nine million, eight hundred eighty-one thousand, seven hundred twenty-eight".