99728240 has 40 divisors (see below), whose sum is σ = 239353728. Its totient is φ = 38603520.

The previous prime is 99728201. The next prime is 99728243. The reversal of 99728240 is 4282799.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99728243) 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, 17627 + ... + 22586.

Almost surely, 2^99728240 is an apocalyptic number.

It is an amenable number.

99728240 is an abundant number, since it is smaller than the sum of its proper divisors (139625488).

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

99728240 is a wasteful number, since it uses less digits than its factorization.

99728240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40257 (or 40251 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 99728240 is about 9986.4027557474. The cubic root of 99728240 is about 463.7380358385.

The spelling of 99728240 in words is "ninety-nine million, seven hundred twenty-eight thousand, two hundred forty".