28299299 has 4 divisors (see below), whose sum is σ = 32342064. Its totient is φ = 24256536.

The previous prime is 28299263. The next prime is 28299317. The reversal of 28299299 is 99299282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28299299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28299239) 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, 2021372 + ... + 2021385.

It is an arithmetic number, because the mean of its divisors is an integer number (8085516).

Almost surely, 2^28299299 is an apocalyptic number.

28299299 is a deficient number, since it is larger than the sum of its proper divisors (4042765).

28299299 is an equidigital number, since it uses as much as digits as its factorization.

28299299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042764.

The product of its digits is 419904, while the sum is 50.

The square root of 28299299 is about 5319.7085446479. The cubic root of 28299299 is about 304.7370267542.

The spelling of 28299299 in words is "twenty-eight million, two hundred ninety-nine thousand, two hundred ninety-nine".