28320099 has 4 divisors (see below), whose sum is σ = 37760136. Its totient is φ = 18880064.

The previous prime is 28320091. The next prime is 28320119. The reversal of 28320099 is 99002382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28320099 - 2³ = 28320091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28320091) 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, 4720014 + ... + 4720019.

It is an arithmetic number, because the mean of its divisors is an integer number (9440034).

Almost surely, 2^28320099 is an apocalyptic number.

28320099 is a deficient number, since it is larger than the sum of its proper divisors (9440037).

28320099 is an equidigital number, since it uses as much as digits as its factorization.

28320099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9440036.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 28320099 is about 5321.6631798715. The cubic root of 28320099 is about 304.8116690960.

The spelling of 28320099 in words is "twenty-eight million, three hundred twenty thousand, ninety-nine".