28399899 has 16 divisors (see below), whose sum is σ = 41468544. Its totient is φ = 17145600.

The previous prime is 28399873. The next prime is 28399901. The reversal of 28399899 is 99899382.

It is not a de Polignac number, because 28399899 - 2⁷ = 28399771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28399829) 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 15 ways as a sum of consecutive naturals, for example, 7819 + ... + 10859.

It is an arithmetic number, because the mean of its divisors is an integer number (2591784).

Almost surely, 2^28399899 is an apocalyptic number.

28399899 is a deficient number, since it is larger than the sum of its proper divisors (13068645).

28399899 is a wasteful number, since it uses less digits than its factorization.

28399899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338.

The product of its digits is 2519424, while the sum is 57.

The square root of 28399899 is about 5329.1555616251. The cubic root of 28399899 is about 305.0976987024.

The spelling of 28399899 in words is "twenty-eight million, three hundred ninety-nine thousand, eight hundred ninety-nine".