28111099 has 4 divisors (see below), whose sum is σ = 28188064. Its totient is φ = 28034136.

The previous prime is 28111093. The next prime is 28111103. The reversal of 28111099 is 99011182.

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 28111099 - 2³ = 28111091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28111099.

It is not an unprimeable number, because it can be changed into a prime (28111091) 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, 37932 + ... + 38665.

It is an arithmetic number, because the mean of its divisors is an integer number (7047016).

Almost surely, 2^28111099 is an apocalyptic number.

28111099 is a deficient number, since it is larger than the sum of its proper divisors (76965).

28111099 is an equidigital number, since it uses as much as digits as its factorization.

28111099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76964.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 28111099 is about 5301.9900980670. The cubic root of 28111099 is about 304.0599885944.

The spelling of 28111099 in words is "twenty-eight million, one hundred eleven thousand, ninety-nine".