28928099 has 4 divisors (see below), whose sum is σ = 29105736. Its totient is φ = 28750464.

The previous prime is 28928093. The next prime is 28928111. The reversal of 28928099 is 99082982.

It is a happy number.

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 28928099 - 2¹² = 28924003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28928093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88574 + ... + 88899.

It is an arithmetic number, because the mean of its divisors is an integer number (7276434).

Almost surely, 2^28928099 is an apocalyptic number.

28928099 is a deficient number, since it is larger than the sum of its proper divisors (177637).

28928099 is a wasteful number, since it uses less digits than its factorization.

28928099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177636.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28928099 is about 5378.4848238142. The cubic root of 28928099 is about 306.9775613403.

The spelling of 28928099 in words is "twenty-eight million, nine hundred twenty-eight thousand, ninety-nine".