99909728 has 12 divisors (see below), whose sum is σ = 196697340. Its totient is φ = 49954848.

The previous prime is 99909721. The next prime is 99909739. The reversal of 99909728 is 82790999.

It is a self number, because there is not a number n which added to its sum of digits gives 99909728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99909721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561058 + ... + 1561121.

It is an arithmetic number, because the mean of its divisors is an integer number (16391445).

Almost surely, 2^99909728 is an apocalyptic number.

It is an amenable number.

99909728 is a deficient number, since it is larger than the sum of its proper divisors (96787612).

99909728 is a wasteful number, since it uses less digits than its factorization.

99909728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122189 (or 3122181 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 99909728 is about 9995.4853809107. The cubic root of 99909728 is about 464.0191728106.

The spelling of 99909728 in words is "ninety-nine million, nine hundred nine thousand, seven hundred twenty-eight".