28109299 has 2 divisors, whose sum is σ = 28109300. Its totient is φ = 28109298.

The previous prime is 28109251. The next prime is 28109309. The reversal of 28109299 is 99290182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28109299 - 2¹³ = 28101107 is a prime.

It is not a weakly prime, because it can be changed into another prime (28101299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14054649 + 14054650.

It is an arithmetic number, because the mean of its divisors is an integer number (14054650).

Almost surely, 2^28109299 is an apocalyptic number.

28109299 is a deficient number, since it is larger than the sum of its proper divisors (1).

28109299 is an equidigital number, since it uses as much as digits as its factorization.

28109299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 28109299 is about 5301.8203477674. The cubic root of 28109299 is about 304.0534986352.

The spelling of 28109299 in words is "twenty-eight million, one hundred nine thousand, two hundred ninety-nine".