28288123099 has 4 divisors (see below), whose sum is σ = 28686547440. Its totient is φ = 27889698760.

The previous prime is 28288123081. The next prime is 28288123117. The reversal of 28288123099 is 99032188282.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (28288123081) and next prime (28288123117).

It is a cyclic number.

It is not a de Polignac number, because 28288123099 - 2¹¹ = 28288121051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28288123009) 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, 199212064 + ... + 199212205.

It is an arithmetic number, because the mean of its divisors is an integer number (7171636860).

Almost surely, 2^28288123099 is an apocalyptic number.

28288123099 is a deficient number, since it is larger than the sum of its proper divisors (398424341).

28288123099 is an equidigital number, since it uses as much as digits as its factorization.

28288123099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398424340.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 28288123099 in words is "twenty-eight billion, two hundred eighty-eight million, one hundred twenty-three thousand, ninety-nine".