99728728 has 64 divisors (see below), whose sum is σ = 211559040. Its totient is φ = 43680000.

The previous prime is 99728723. The next prime is 99728729. The reversal of 99728728 is 82782799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99728723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472543 + ... + 472753.

It is an arithmetic number, because the mean of its divisors is an integer number (3305610).

Almost surely, 2^99728728 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 99728728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105779520).

99728728 is an abundant number, since it is smaller than the sum of its proper divisors (111830312).

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

99728728 is a wasteful number, since it uses less digits than its factorization.

99728728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 396 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The square root of 99728728 is about 9986.4271889400. The cubic root of 99728728 is about 463.7387922401.

It can be divided in two parts, 99 and 728728, that added together give a palindrome (728827).

The spelling of 99728728 in words is "ninety-nine million, seven hundred twenty-eight thousand, seven hundred twenty-eight".