99331728 has 40 divisors (see below), whose sum is σ = 265459200. Its totient is φ = 31968384.

The previous prime is 99331723. The next prime is 99331759. The reversal of 99331728 is 82713399.

It is a self number, because there is not a number n which added to its sum of digits gives 99331728.

It is not an unprimeable number, because it can be changed into a prime (99331723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34288 + ... + 37071.

It is an arithmetic number, because the mean of its divisors is an integer number (6636480).

Almost surely, 2^99331728 is an apocalyptic number.

It is an amenable number.

99331728 is an abundant number, since it is smaller than the sum of its proper divisors (166127472).

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

99331728 is a wasteful number, since it uses less digits than its factorization.

99331728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71399 (or 71393 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 99331728 is about 9966.5303892578. The cubic root of 99331728 is about 463.1226236262.

It can be divided in two parts, 993317 and 28, that added together give a triangular number (993345 = T₁₄₀₉).

The spelling of 99331728 in words is "ninety-nine million, three hundred thirty-one thousand, seven hundred twenty-eight".